Changed context names to avoid collision with user-specified .cal file names
Increased the limit on open files in rcontrib from 512 to 2048 under Windows
Added missing -c option in usage message
newer C++ compilers have a standard type named "bool". rename macro to get rid of warnings.
Initial check-in of photon map addition by Roland Schregle
Fixed bug in parameter parser and added check during main arguments processing
Added -p option to specify per-modifier function file parameters
Added missing check for missing modifier
Eliminated a number of minor warnings (all innocuous)
Shortened context name to "RC" from "RCONTRIB"
Added check for blocked shadow rays
Moved source initialization
More portability fixes (missing headers)
Accommodations for Windows
Simplified modifier lookup
Fixed a number of bugs -- still testing
Tweaks and bug fixes to new code
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