Prepare for SCons build on Win32 and Win64
Instrumented headers against multiple inclusion and for use from C++. Moved includes in headers out of "C" scope.
Replaced most outdated BSD function calls with their posix equivalents, and cleaned up a few other platform dependencies.
Broke standard.h into rtio.h, rterror.h, rtmath.h, and rtmisc.h
Abstracted process and path handling for Windows. Renamed FLOAT to RREAL because of conflict on Windows. Added conditional compiles for some signal handlers.
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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
added missing #endif
avoid redefinition of bzero()
Initial revision
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