Modernized tone-mapping routines with structure pointer r.t. stack
Broke standard.h into rtio.h, rterror.h, rtmath.h, and rtmisc.h
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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
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