Broke standard.h into rtio.h, rterror.h, rtmath.h, and rtmisc.h
Instrumented headers against multiple inclusion and for use from C++. Removed NOPROTO sections.
Replaced inline copyright notice with #include "copyright.h"
Changes and check-in for 3.5 release Includes new source files and modifications not recorded for many years See ray/doc/notes/ReleaseNotes for notes between 3.1 and 3.5 release
added -aw option for ambient value weight
added memory sorting to ambient caching module
changed magic number for ambient files
added header and magic number to ambient value file
made ambient files portable between machines
updated revision number for release 2.0
made ambient value weighting incremental (fewer stored values)
Initial revision
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