Reworked rtcontrib into rcontrib program
Added -c option to repeat pixels
Added -u option to vwrays for unbuffered output with -i
Minor fix
Changed ".pic" extension to ".hdr" throughout
Added backslashes in front of hyphens (thanks to Bernd Zeimetz for his effort)
Added -pj option to vwrays for ray jittering
Got rtcontrib working and wrote basic man page
Fixed RCSid specification
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