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
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