If the proper (recommended) binning size is used, it should be
possible to measure source counts with the positive tail of the
histograms
Rounds up rebinned pixel size to the nearest integer multiple of
the elementary pixel size of the input images
Ignores pixels on the edges that do not fit in an integer number
of rebinned pixels
Temporary files are created with the names specified in the
parameter tmpflatsets and are deleted when they are no longer needed,
at the end of the task.
