Extensive changes to enable rtrace -oTW option for tracking ray contributions
Continued ANSIfication. There are only bits and pieces left now.
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
changed modifier checking to take most recent definition
added isflat() macro and effective ray distance for mirror reflection
changed behind test to allow for source sampling
changed behavior of mirror so that void alternate makes transparent
made mixtures work with materials
added check for ray penetration
updated revision number for release 2.0
fixed logic on substitute materials
added redirecting materials
Initial revision
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