Continued ANSIfication. There are only bits and pieces left now.
Made errno checking explicit after math calls to avoid spurious warnings
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
made mixtures work with materials
modified use of functional modifiers to allow single argument
changed function file calls to allow expressions instead of just vars
updated revision number for release 2.0
added contexts to function files
eliminated unnecessary loopy
changed ordering of in-memory array for pictures
simplified errno test
Initial revision
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