feat(rpict,rtrace,rcontrib,rtpict): Hyperspectral rendering (except photon map)
refactor: Changed some char* args to const char* to avoid warnings
feat: removed upper limit on number of modifiers in rcontrib
feat(rcontrib,rfluxmtx): Added -t option to specify progress report interval
Hopeful fix to issue with rcontrib writing multiple records/pixel
Improved error-checking for too many words in file or string
Prepare for SCons build on Win32 and Win64
Added appropriate setting of ray parameters for bin rcontrib evaluation
Fixed bug in parameter parser and added check during main arguments processing
Added -p option to specify per-modifier function file parameters
Eliminated a number of minor warnings (all innocuous)
More portability fixes (missing headers)
Accommodations for Windows
Added quick-exit mode and fixed bug in recovery option with -c > 1
Improved performance for -c 0 option
Simplified modifier lookup
Further efficiency improvements
Tweaks and bug fixes to new code
Created rcontrib program (eventually to replace rtcontrib)
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