fix(vwrays): No longer spits out -ld- with -d option, only -ld+
feat(vwrays,rtpict): Added support for -pd option to sample depth-of-field
Added ability for pinterp, pmblur2, and vwrays to read 16-bit encoded depth
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
Added documentation to repository
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