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
fixed variable ordering
added intermediate sky and changed +c option to -u
minor simplification
paranoia
added +c option for uniform cloudy sky
updated revision number for release 2.0
Initial revision
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