RETVALUE

This option, suggested by Sergei Chechetkin
<csl@whale.sunbay.crimea.ua>, causes GIFTool to provide a return
value so may be used in pipes or with programs like make(1).

MALLOCSIZE

This option, suggested by Hidetoshi Shimokawa
<simokawa@sat.t.u-tokyo.ac.jp>, increases the size of a malloc, to
avoid a segmentation fault when pre-reading some images.