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 printing of command arguments in header
second cut at random sampling -- variable randomness
first cut at random resampling algorithm
added brain-dead pixel filling for unrendered pixels
finished discontinuity implementation and fixed various bugs
added kernel and occlusion culling
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