Improved default ordinal color scale in falsecolor
Added grouping parens to reduce ambiguity warnings.
Moved some more platform dependencies to common header files. Included a few necessary system headers.
Abstracted process and path handling for Windows. Renamed FLOAT to RREAL because of conflict on Windows. Added conditional compiles for some signal handlers.
Reduced compile warnings/errors on Windows.
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
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