Instrumented headers against multiple inclusion and for use from C++. Moved includes in headers out of "C" scope.
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
updated version with bug fixes(?)
updated revision number for release 2.0
Initial revision
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