docs: moved -p* options together
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 remark to clarify what "resolution" means
Removed erroneous reference to (unsupported) -n in combination with -aC
Fixed incorrect wording on -lr option
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
Added photon map support to rad
Initial check-in of photon map addition by Roland Schregle
Changed sampling to use Hilbert curve as suggested by Lars Grobe
Enabled back face invisibility (-bv0) for transparent/translucent types
Changed -sj option to -ss and added multiple specular sampling
Corrected description of -lr option.
Changed ".pic" extension to ".hdr" throughout
Added planisphere view type (-vts option) as requested by Axel Jacobs
Added backslashes in front of hyphens (thanks to Bernd Zeimetz for his effort)
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
Added -oM option to rtrace to output material
Replaced instances of "/usr/tmp" with "/tmp" in scripts & documentation
Added comment about -vd length being used by -pd option
Added -pd option for depth-of-field sampling and -vd focal distance entry
Renamed rview, lam, calc, and neat to rvu, rlam, icalc, and neaten
Fixed RCSid specification
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