docs: Wording fixes to man pages regarding -e and -f options
feat(rpict,rtrace,rvu,rxpict,rxtrace,rxpiece): Added -e expr and -f file.cal options
chore(rcomb): Renamed rmtxcomb to simpler "rcomb"
docs(rmtxcomb): Added man page for new rmtxcomb tool
docs: Made note that outputs for -pY, -pS, and -pM are luminance values
feat(rpict,rtrace,rcontrib,rtpict): Hyperspectral rendering (except photon map)
feat(rpict,rtrace,rcontrib): Added -features option to check for method support
docs: made use of "virtual" and "secondary" sources more consistent
Added reference to rsplit
Made -f?c RGBE output compatible with any of 'vVWrx' options and added warning
Fixed incorrect wording on -lr option
Added -orRxX options to rtrace for VR rendering
Wrote rtpict program to run rpict as if it had a -n option
Documented treatment of contrib photons as global under rpict/rtrace
Updated man pages with pmap parallelisation and ooC options
Revised -am and -ab options, the latter defaulting to 1 in pmap mode
Initial check-in of photon map addition by Roland Schregle
Enabled back face invisibility (-bv0) for transparent/translucent types
Tweaks and fixes related to flushing with -c >1
Reworked rtcontrib into rcontrib program
Changed -sj option to -ss and added multiple specular sampling
Eliminated flushing with -x >1 if -y also set to improve -n performance
Corrected description of -lr option.
Eliminated restriction with -n and -I in rtrace
Added -n option to rtrace and moved quit() funciton out of raypcalls
Fixed error in example
Changed ".pic" extension to ".hdr" throughout
Added backslashes in front of hyphens (thanks to Bernd Zeimetz for his effort)
Added -V option to rtcontrib and -oV option to rtrace to report contributions
Had to change new -R rendering option to -u to avoid conflict with rpiece
Added -R option for pure Monte Carlo rendering, replacing -DMC compile option
Added Russian roulette ray termination and fixed ambient weights & measures
Wording tweaks
Got rtcontrib working and wrote basic man page
Created rtcontrib program for computing ray contributions and coefficients
Extensive changes to enable rtrace -oTW option for tracking ray contributions
Added -oM option to rtrace to output material
Replaced instances of "/usr/tmp" with "/tmp" in scripts & documentation
Renamed rview, lam, calc, and neat to rvu, rlam, icalc, and neaten
Fixed RCSid specification
Added rtrace -oc option to output local (u,v) coordinates
Added documentation to repository
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