docs(pcomb, pcompos): Added remarks about EXPOSURE settings
feat(rcrop): Created simple cropping utility for matrices and pictures
Added Roland and Andreas' request to place images using -a from top-left
Fixed man page regarding maximum number of files
Changed ".pic" extension to ".hdr" throughout
Added backslashes in front of hyphens (thanks to Bernd Zeimetz for his effort)
Added -h option to pcompos and pcomb to avoid uncontrolled header growth
Fixed RCSid specification
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