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ChangeLog for evselect
======================

Version 3.47.8 - 2002-11-18 (DH)
--------------
+ Replace E_MIN, E_MAX, E_UNITS keywords in light curves with CHANMIN, CHANMAX
CHANTYPE keywords, as these better convey wanted filtering information.

Version 3.47.7 - 2002-10-15 (DH)
--------------
+ Update DEPEND file for new dsslib.
+ Update documentation. Closes SSC-SPR-2974.

Version 3.47.6 - 2002-09-24 (DH)
--------------
+ No change.

Version 3.47.5 - 2002-09-23 (DH)
--------------
+ Take cout debug print statements (sigh!).

Version 3.47.4 - 2002-09-23 (DH)
--------------
+ Fix problem with merging of GTIs when updating exposure info. GTIs must
be sorted before they are merged. Closes SSC-SPR-2985.
+ Fix algorithm for writing LTV/M keywords. Closes SSC-SPR-2967.
+ Write new set of WCS keywords of type 'L'. These are for the physical
coordinate system, and provide the same info as the LTV/M keywords, which
will soon be deprecated.

Version 3.47.3 - 2002-05-16 (DH)
--------------
+ Documentation updates. Closes SPR 2825.

Version 3.47.2 - 2002-02-27 (DH)
--------------
+ Fix bug which caused an infinite exposure to be calculated for some
products if the input filtered event list was empty.

Version 3.47.1 - 2002-01-28 (DH)
--------------
+ Documentation updates.

Version 3.47 - 2001-11-21 (DH)
------------
+ Rearrange parameter file so that parameters are in same order as in the
documentation.
+ Initialize various variables to zero in wcs_proj.c in order to avoid
optmized compiler warnings on linux.
+ Removal of un-needed EXPOSUnn extensions now occurs when exposure updating
is set, even if no TIME filtering is done.
+ Fix bug which in some cases caused the last bin (ie. row) in a histogram
or lightcurve not to be created. Closes SSC-SPR-2656.
+ If the column used to accumulate a histogram is named COUNTS, it now gets
rename to OLD_COUNTS in the histogram, instead of crashing evselect.
Closes SSC-SPR-2637.

Version 3.46 - 2001-11-21 (DH)
------------
+ Increment version number for book keeping purposes.

Version 3.45 - 2001-11-21 (DH)
------------
+ Include string.h and stdio.h in wcs_proj.c . Hopefully fixes a Dec compile
problem.

Version 3.44 - 2001-11-07 (DH)
------------
+ Check for existence of CCDNR column in XmmExposure constructor. Closes
SSC-SPR-2622.

Version 3.43 - 2001-10-29 (DH)
------------
+ Incorporate C version of wcslib into the evselect code.
+ Add option to shift image to be centered at a given Ra and Dec. Closes
SAS-SCR-11.
+ Remove makesparserates option, as this produces a lightcurve which is
a mis-interpetation of the OGIP standard. Closes SSC-SPR-1975.
+ Add makeratecolumn option, which makes a RATE column instead of a COUNTS
column in a light curve. Closes SAS-SCR-12.

Version 3.42 - 2001-10-16 (DH)
------------
+ Mention imagechain in documentation as an example of evselect use.

Version 3.41 - 2001-10-12 (DH)
------------
+ Fix problems causing compiler problems with optimization turned on. Some
pointers needed to be initialized to zero. Closes SSC-SPR-2595.

Version 3.40 - 2001-10-11 (DH)
------------
+ Add spectrum accumulation using a 'weight' column (withzcolumn=true). For
spectra, light curves and histograms the error column for the weight
(withzerrorcolumn=true) is now optional.

Version 3.39 - 2001-09-24 (DH)
------------
+ Changed all standard containers to use the explicit std:: scope operator.
+ Implement SCR 66: Inefficient selection of EXPOSUnn extensions. Note that
the algorithm is executed only when evselect thinks it needs to update
exposure information.
+ Fix some errors in the documentation introduced in 3.38 .
+ Fix error in algorithm used for caculating exposure for a spectrum region
that spans more than one ccd. Exposure was being over estimated.
Closes SSC-SPR-2570.

Version 3.38 - 2001-09-19 (DH)
------------
+ Major rework of getGtiLists method of XmmExposure. Now more robust in
determining which TIME filters can be appropriately applied for exposure
correction. Closes SSC-SPR-2285 and SSC-SPR-2467.

Version 3.37 - 2001-08-13 (DH)
------------
+ Change system and compiler include statements to conform to standard.
+ Change test harness bourne shell script so that queried keyword values
are returned correctly on all systems. Fixes SSC-SPR-2396.
+ Warning now given when doing exposure updating if data subspace parsing
failed. Closes SSC-SPR-2029.
+ Use new compressRegions() method to compact data subspace when old and
new dss specifications have been combined.
+ Change test harness to reflect different polygon algorithm in selectlib.
+ Change exposure info correction so that it no longer requires access to
the ccf via the cal. Closes SCR-73.

Version 3.36 - 2001-08-06 (DH)
------------
+ Test for zero bin sizes. Fixes SSC-SPR-2241.
+ Add writing of LTV/LTM coordinate keywords to extracted images. Closes
SCR 27.
+ Empty product tables are now created when no events are selected. Closes
SCR 24. Documentation updated for relavent error and warning messages.
+ Option for calculating BACKSCAL keyword in evselect removed from the
documentation. Closes SSC-SPR-2405.

Version 3.35 - 2001-04-19 (DH)
------------
+ Remove iostream.h includes.
+ Remove backscale calculation option from spectral extraction.

Version 3.34 - 2001-02-21 (UL)
------------
+ brought in line with cal-3.100

Version 3.33 - 2000-12-22 (UL)
------------
+ a couple of trivial changes to make the optimizer happy

Version 3.32.5 - 2000-11-07 (DH)
--------------
+ Rework Image page of evselect layout file in order to account for limitations
in the GUI parameter interface.

Version 3.32.4 - 2000-10-27 (DH)
--------------
+ Update info file.
+ Now issue seperate warnings depending on whether the input event list is empty,
or the event list is empty after filtering. Closes SSC-SPR-1997.

Version 3.32.3 - 2000-10-26 (DH)
--------------
+ Fix SSC-SPR-2003, "temporary dataset not released"
+ Minor change to test harness.
+ Really fix the test harness for linux.

Version 3.32.2 - 2000-10-20 (DH)
--------------
+ Fix bug causing floating excpetion on DEC when filtered event lists are empty.
+ Loosen pass criteria for evselect EXPOSURe calculation, so it will pass on
linux.

Version 3.32.1 - 2000-10-12 (DH)
--------------
+ Add documentation and layout for the dssclean parameter.
+ Evselect now only filters EXPOSUnn extension if keepfilteroutput=true, ie.
only when the event list is being written out or modified.
+ Slight change to how empty GTIs are handled when filtering EXPOSUnn extensions.
+ Add '#include ' to evselect.cc and xmmselect.cc . Hopefully will fix
linux problem.

Version 3.32 - 2000-10-02 (DH)
------------
+ Add filtering of EXPOSUnn extensions in exposure correction. Controlled by
the filterexposure parameter.
+ Remove tempsetmemenv from evselect. Closes SSC-SPR-1852.
+ Evselect now always writes CHANTYPE keyword when making spectra, setting it
to the name of the extraction column. Closes SSC-SPR-1946.
+ EXPOSURE keyword for images calculated as per JO proposal. Lightcurve EXPOSURE
now done as for spectra. Closes SSC-SPR-1943.
+ Add/remove parameters from lyt file to reflect recent changes.

Version 3.31 - 2000-10-02 (DH)
------------
+ Change error checking for datasubspace parser, so that now a warning is issued
in case of failure, rather than an error.
+ New parameter 'calculatebackscale', which turns on the calculation of the BACKSCAL
keyword for spectra. Closes SSC-SPR 1944.
+ Changes to prevent BACKSCAL calculation from consuming unreasonable amounts of
memory. Hopefull closes SSC-SPR 1958.

Version 3.30 - 2000-09-22 (DH)
------------
+ In exposure correction, allow for a TIMEDEL keyword replacing a TIMEDEL column
in the EXPOSUnn extensions.
+ New parameter ingorelegallimits, which if true causes evselect to ingore TLMIN
and TLMAX when keywords when setting column extraction limits.
+ Remove MaxDataRange and MinDataRange warnings, as these were not working properly
anyway.

Version 3.29 - 2000-08-01 (DH)
------------
+ Fix SSC-SPR-1939, cannot create a non real-64 image with --withzcolumn=true
+ Fix SSC-SPR-1941, evselect should create a SYS_ERR keyword
+ Fix SSC-SPR-1942, icorrect(sic) value assigned to backscal keyword

Version 3.28 - 2000-07-27 (DH)
------------
+ Add missing '#include ' to spec.cc .
+ Remove EXPOSURE keyword from light curve and image products.

Version 3.27 - 2000-07-20 (DH)
------------
+ Test whether x/y columns exist before trying to calculate the BACKSCAL
keyword. Closes SCC-SPR-1932.
+ Change slightly meaning of keepfilteroutput parameter, so that if it is
false, then the value of the withfilteredset is ignored, and no output
event list is written. Closes SSC-SPR-1930.

Version 3.26 - 2000-07-19 (DH)
------------
+ Incorporates all changes through evselect 3.25.10.
+ Implement calculation of BACKSCAL keyword in spectrum production. Update
documentation. Closes SPR 1674.
+ Fix the some bad uses of the kn macro in the documentation. Closes SPRs
1895 and 1896.
+ Add 'squarepixels' parameter, which forces x and y bin sizes to be the same
when imagebinning=imageSize. Update documentation. Closes SOC SCR 1607.
+ Add 'Sparse' message about the number of events selected. Closes SCR on
"NUmber of selected events".
+ Add test, so that if the user selects that no output be produced (or files
modified), then evselect exits before doing any significant processing.
+ Add warning message when updateexposure=true and writedss=false.

Version 3.25.10 - 2000-07-06 (DH)
---------------
+ Fix test so it does a more robust comparison of real exposure values, using
a perl call.

Version 3.25.9 - 2000-07-06 (GV)
--------------
+ edit away DATE and CREATOR from test/ev1000.fits.

Version 3.25.8 - 2000-07-05 (UL)
--------------
+ fixed small /bin/sh compatability problem in test/evseltest
(caused test to fail with sh syntax error under Linux).

Version 3.25.7 - 2000-07-03 (DH)
--------------
+ Fix problem which was causing exposure correction to only work properly for simple
selection expressions.
+ Fix bug which was causing crash when a (cleaned) data subspace had no components.

Version 3.25.6 - 2000-06-23 (DH)
--------------
+ E_MIN, E_MAX and E_UNITS now written to rates files. Update docs. Fixes SPR 1650.
+ Rearrange layout file to reflect the mulitple uses of the parameter energycolumn.
+ test harness file ev.fits had been corrupted. Replace with file from old version.

Version 3.25.5 - 2000-06-21 (DH)
--------------
+ Fix SPR 1853, Small typo into config file for ycolumn.
+ SPR 1775 closed in dsslib 3.0.3 .
+ Add new attributestocopy parameter for copying attributes from the input
table to the output products table or array. Closes SPR 1842.

Version 3.25.4 - 2000-06-15 (DH)
--------------
+ Added calculation of EXPOSURE keyword for images and lightcurves. Closes
SSC-SPR-1764.
+ SPR 1778 closed in dsslib 3.0.2 .
+ SPR 1814 closed in dsslib 3.0.2 .
+ Fix SPR 1825, DOC::broken links.
+ Fix bug with propogating units to histograms. Closes SPR 1839.

Version 3.25.3 - 2000-06-12 (DH)
--------------
+ Major upgrade to ``Extraction Stage'' section of documentation, as well as
some other small changes. Closes SPRs 1451 and 1711.
+ Fix test harness to better catch exposure calcualtion errors.

Version 3.25.2 - 2000-06-05 (DH)
--------------
+ Fix SPR 1704, Does not write ONTIME and LIVETIME in event list.
Exposure information was never being updated.

Version 3.25.1 - 2000-06-01 (DH)
--------------
+ Fix problem causing crashes for some spectral extractions
+ Fix SPR 1691, changes not documented
+ Fix SPR 1692, GTI filter set not released (closed in dsslib 3.0.1)
+ Fix SPR 1697, task fails if selected time interval has no events (closed in dsslib 3.0.1)

Version 3.25 - 2000-05-29 (GV)
------------
+ Copy test data sets from 3.23, as they had been dspurified.

Version 3.24 - 2000-05-29 (UL)
------------
+ fixed problem in XmmExposure::XmmExposure() (EMOS2 and EPN were
not handled correctly)
+ more elegant way to set the instrument of the CAL state

Version 3.23 - 2000-05-26 (DH)
------------
+ Add propagation of RGS keywords from region extensions
to spectrum file in the exposure updating part of evselect.
+ Fix problem which may have been causing CCDNR column to be
required when it shouldn't be.
+ Handle range type TIME filters in exposure updating for
EPIC insturments (closes SPR 1623).
+ Fix setting of column units in light curve generation
(closes SPR 1675).
+ Change default values to: destruct=true, keepfilteroutput=false.
+ Fix bug which was determining wrong limits under some
circumstances.

Version 3.22 - 2000-05-16 (DH)
------------
+ Fix bug in calculation of TLMAX value for a spectrum's
CHANNEL column.
+ Fix bug in calculation of a spectrum's SPECVAL keyword.
+ Add propagation of the RGS EXPOSURE keyword to a spectrum.
+ Change exposure correction so it complains rather than
aborts if it cannot update exposure info.
+ Make writedss=true and updateexposure=true the defaults.

Version 3.21 - 2000-03-05 (DH)
------------
+ Fix bug in calculation of the SPECVAL keyword.
+ Fix yet another bug causing array overwrites in image
extraction under special circumstances.

Version 3.20 - 2000-03-22 (DH)
------------
+ Fix bug that was causing crashes when an image was extracted
under certain special conditions. Evselect was writing
outside of array bounds (closes SPR 1586).
+ Make calculation of exposure information more robust - a
DSS spec is no longer required, and some problems dealing
with missing EXPOUSnn extensions fixed.

Version 3.19 - 2000-03-08 (DH)
------------
+ Fix bug introduce in 3.18 - temporay dataset opened with
wrong dal mode.

Version 3.18 - 2000-03-08 (DH)
------------
+ Use new DataSetServer::clone function in evselect.cc .
+ Switch to using tempnam to generate temporary file names.

Version 3.17 - 2000-02-29 (DH)
------------
+ Add data subspace 'cleaning' to generation of dss info in
evselect. See description of cleanDSS in dsslib documentation
for details.
+ Minor change to layout file, making updateexposure dependant on
writedss.
+ Remove unexecutable block from evselect.cc .

Version 3.16 - 2000-02-24 (DH)
------------
+ Fix SPR 1500, spectrum extraction requires CCDNR column
+ Change spectrum extraction so that it now does true binning,
instead of OGIP grouping. Keywords are written to the spectrum
giving information on the binning and offset.

Version 3.15 - 2000-02-21 (UL)
------------
+ brought in line with selectlib-4.28 (selected rows are now marked
by _setting_ flag bit)
+ updated description of parameters 'flagbit'/'flagcolumn' accordingly

Version 3.14 - 2000-02-21 (DH)
------------
+ Fixed up DEPEND file.
+ Changes to test harness to improve test harness.

Version 3.13 - 2000-02-17 (DH)
------------
+ Exposure information now updated by evselect, as per agreed
procedures. New parameter updateexposure to control this,
turned off by default. Closes SPR 1315. Docuemntation
updated.

Version 3.12 - 2000-02-15 (UL)
------------
+ if "imagebinning=imageSize" store effective bin size in task
parameters "xy/imagebinsize" such that meta-tasks like xmmselect
can read them; this is necessary to fix SOC-SPR 1148: region not
properly transformed when imagebinning=imageSize

Version 3.11 - 2000-02-10 (DH)
------------
+ Fixed bug which caused read-only failure in some cases when using
a null filtering expression.
+ Fixed SPR 1461, "evselect not recognising WCS keywords". This was
due to the fact that the block copying function in the Dal does not
copy column attributes.

Version 3.10 - 2000-02-04 (UL)
------------
+ for keepfilteredoutput=no the input data set is now copied to
a Temp data set which is destructively filtered; advantage:
in highmem mode, the filtered Temp set is never written back to
disk which improves the execution time; in the lowmem case, the
opening of the Temp set can be enforced in highmem mode with
tempsetmemenv=false

Version 3.9 - 2000-02-02 (DH)
-----------
+ Fix SPR 1450 "Attempts to modify read-only object". Fix also closes
SPR 1162 "evselect should put temporary columns in a temporary dataset"

Version 3.8 - 2000-01-28 (DH)
-----------
+ First version with data subspace support
+ Fix problem with sizing of images from integer-valued columns
+ Replace boolean parameter withimagebinsize with string parameter imagebinning.
This change is not backward compatible, but should only effect the down-stream
task imagechain.
+ Incorporate new parameters into layout file.
+ Rationalize the behaviour of keepfilteredoutput and withfilteredset parameters
to be consistent with the documentation.
+ Allow real-valued columns as input for spectral extraction. Real values are
truncated to integers before the spectrum is accumulated.
+ Change COUNTS column in spectra from Int16 to Int32.

Version 3.7 - 1999-12-20 (DH)
-----------
+ Fix SPR 1162, HDUCLAS2 to be ALL or ACCEPTED depending on destruct parameter
+ New histogram prodcut type, for general binning of real or integer columns.
+ New parameters for controlling the extracted image size. Now by default the
size of the image is specified, rather than the binning factor.
+ Update documentation to reflect above changes.

Version 3.6 - 1999-09-15 (GV)
-----------
- fix DEPEND

Version 3.5 - 1999-09-13 (UL/DH)
-----------
+ documentation:
+ removed 'DOCS = evselect/evselect.html' from Makefile as
this is now automatically handled by Make.include
+ fixed SOC-SPR 774: wrong use of /warn{} in user doc.
+ fixed SOC-SPR 775: use of own formatting is documentation
+ more general cleanup of marcos and error messages.
+ Now writes selection expression to the keyword SLCTEXPR, which is
propogated to the products. The old history keywords specifying
the parameters used in evselect have been removed.
+ Clean up error messages detailing that OGIP spectra must be extracted
from and integer-valued energy column. Change spectralbinsize parameter
to an integer type.

Version 3.4 - 1999-08-26 (DH)
-----------
+ Remove spurious debugging message.
+ Minor fixes to documentation.

Version 3.3 - 1999-08-12 (DH)
-----------
+ Change COUNTS column in spectral files from Int32 to Int16 in
order to conform to the OGIP standard.

Version 3.2 - 1999-08-06 (DH)
-----------
+ Fix bug which corrupted output event list when extracting images
+ New algorithm for generating temporary column names.

Version 3.1 - 1999-08-05 (DH)
-----------
+ Fix bug in implementation of the 'table' parameter, put test of
'table' syntax into the test harness.
+ Fix SPR 1142, HDUCLAS3 keyword.
+ Fix SPR 1156, documentation updated.

Version 3.0 - 1999-07-30 (DH)
-----------
+ Change 'set' parameter to 'table' parameter, using Dal set:table convention.
+ Fix SPR 913, so that 'zcolumn' now populates lightcurves, and add 'zerrorcolumn'
parameter for light curve rate errors.
+ Fix SPR 1002 by changing warning messages for constant columns.
+ Remove all mention of second order quantities from task description, as the
generation of these quantities is now to be contained in the task 'tabcalc'.
Close SPR 625 as it is no longer relavent.
+ Change default value of 'flag' parameter to EVFLAG to avoid conflict with
the standard FLAG column in event lists.

Version 2.1 - 1999-07-06 (DH)
-----------
+ Fix SPR 861, type of image should be selectable from the command line
+ Fix SPR 1011, Documentation mistake
+ Fix SPR 1012, Mistake in test harness
+ Fix SPR 1015, SAOIMAGE coordinates
+ Update documentation and layout file for new parameters for setting type of image

Version 2.0 - 1999-05-28 (DH)
-----------
+ Fix SPR 284, evselect extension propagation.
A parameter blockstocopy has been added for this purpose.
+ Eveselect now attempts to estimate the smallest sensible data type for
an image, and then uses that value when extracting the image.
+ Expressions can now be used to specify extraction columns.
+ TSTART and TSTOP now set in time series according to agreed convention.
+ New parameters maketimecolumn and makesparserates to control creation
of time series files.
+ Renaming of parameters to conform to new standard. These changes are
of course NOT BACKWARD COMPATIBLE.
+ Addition of new controlling boolean parameters. Gui layout file reworked
to reflect this new structure.

Version 1.24 - 1999-05019 (DH)
------------
+ Fix SPR 996, evselect generated images should contain WCS attributes.
+ Fix SPR 997, evselect.lyt missing from CONFIGFILES.

Version 1.23 - 1999-05-12 (UL)
------------
+ added support for subexpressions in table attributes
(see CHANGE HISTORY in evselect.cc or documentation for details)

Version 1.22 - 1999-05-11 (UL)
------------
+ brought in line with error-1.18

Version 1.21 - 1999-04-16 (UL)
------------
+ brought in line with selectlib 4.0

Version 1.20 - 1999-03-04 (DH)
------------
+ Change extractor code to make correct use of the data() method.
+ Add evselect.lyt to the Makefile in the config directory.

Version 1.19 - 1999-03-04 (UL)
------------
+ config/evselect.par: 'infile' is now the only mandatory parameter ('q'),
all others are optional ('h')

Version 1.18 - 1999-03-02 (UL)
------------
+ test/region.fits + test/region2.fits: value of TDIM1 was wrong:
16 instead of 20 - problem revealed by switch to cfitsio 2.0

Version 1.17 - 1999-03-02 (UL)
------------
+ config/evselect.lyt: newly added file to improve the look of the
parameter dialog

Version 1.16 - 1999-02-11 (UL)
------------
+ src/evselect.cc: added include statement enforced by taskmain >v1.17

Version 1.15 - 1999-01-25 (DH+UL)
------------
SPR 872 fixed in selectlib 3.18. Slight change to test harness.

Version 1.14 - 1999-01-19 (DH)
------------
+ SPR's fixed:
171, Own clobber + system calls
593, Image generation
622, When entering a bad type of file, the error message is not clear
628, There is no differences between different verbosity levels
633, When the rate time range is invalid, evselect does not produce an output
817, evselect crashes when destructive=yes
851, spectrum extraction incorrect when TLMIN/TLMAX keywords missing
858, wrong message mechanism
873, Mask cannot be in primary array [fixed in selectlib 3.17,
DEPEND file updated]
+ Spectral binning now done via OGIP grouping conventions.
+ Seperate binning factors for x and y in image extraction.
+ Filtering step only executed when necessary.
+ Input file opened readonly when not modified.

Version 1.13 - 1998-11-04 (DH)
------------
+ fix SPR 588 (includes selectlib fix by UL)
+ Remove lower limit on image extraction range parameters
+ Open input file read-only if it will not be modified

Version 1.12 - 1998-10-22 (DH)
------------
+ fix bug in the writing of keywords for rates files

Version 1.11 - 1998-10-14 (DH+UL)
------------
+ fix for mods to test files that were missed out in 1.10

Version 1.10 - 1998-10-07 (DH+UL)
------------
+ added test to check correctness of WCS support in mask filter
(selectlib-3.11)

Version 1.9 - 07-10-98 (DH)
-----------
+ Minor fix to work around selectlib operator bug.

Version 1.8 - 21-09-98 (DH)
-----------
+ Changes to make evselect work with the new parameter system,
including a work around for parameters with no default values.
+ Modified evseltest so no attempt is made to use the yet to be
implemented clobber parameter.

Version 1.7 - 26-08-98 (DH)
-----------
+ Parameters can be used to specify ranges for all types of extraction
+ Much broader support for extraction of data from columns of various data types
+ Light curve extraction implemented
+ WCS keywords supported for image extraction
+ Bug fix for problem when creating non-square images
+ closed SPR 018, No image file has been created
+ closed SPR 282, Keywords detection and propagation problem
+ closed SPR 460, Don't create output file with no data in it
+ closed SPR 518, zcol for image and rate file creation
+ closed SPR 520, Rates file creation

Version 1.6 - 03-06-98 (UL+DH)
-----------
+ fixed SSC-SPR 169 (generic main)
+ fixed SSC-SPR 290 (doc)
+ brought in line with selectlib v3.0
+ d/f value of flagbit parameter is now -1 (most-significant-bit)
+ doc/evselect.tex removed - now constructed on the fly by 'make ps'
+ Uses new Dal (1.18) functions and API.
+ Support for FLAG column of type Int8, Int16 and Int32.
+ Image is now created in the primary array.
+ More robust test harness for image and spec creation.
+ fixed SPR 001 (Empty error and warning codes)
+ fixed SPR 366, Move TODO section into developer's section of description
+ fixed SPR 368 (Use type f for file parameters
+ fixed SPR 370, evselect.tex should closely follow template
+ fixed SPR 371 (Remove dalif from USEDLIBS)
+ fixed SPR 372 (Do not modify CXXFLAGS)
+ fixed SPR 496 (Upgrade required)
+ fixed SPR 497 (Compilation Errors)

Version 1.5 - 27-05-98 (UL)
-----------
+ fixed SSC-SPRs 168, 170, 175
+ write task parameter values to history section of filtered event list
file

Version 1.4 - 21-05-98 (DH)
-----------
+ Added valid DEPEND file
+ Deleted NEWS.html
+ Added this Changelog file
+ SPR's fixed:
167, Spurious files
172, Add FITS files to CLEANFILES
173, Colon in .par file
174, Test harness fails