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
Created rcontrib program (eventually to replace rtcontrib)
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