Added close-on-exec flag to pipes to prevent possible deadlocks
Added -n option to mkillum for multiprocessing on shared memory machine
Fixed up comments in header
Continued ANSIfication. There are only bits and pieces left now.
Added grouping parens to reduce ambiguity warnings.
Eliminated copystruct() macro, which is unnecessary in ANSI. Reduced ambiguity warnings for nested if/if/else clauses.
Added -N option to rad for parallel rendering (preliminary w/o using -PP)
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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