Reduced compile warnings, and other compatibility fixes.
Fixed prototype for freemtl() to match function pointer in lookup.h
Added check for mesh primitive and warning when encountered
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
Initial revision
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