imltogif.icn: Program to convert image strings to GIF files

This program converts a list of image strings given in standard input
to corresponding GIF images.
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The options supported are:

     -n s    sets prefix for image file names to s, default "image"
     -c i    number of columns for serial numbers in file names;
               default 4
     -f i    first number, default 1
     -p      treats image string as a pattern and fills a square
                window of its maximum dimension