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
changed behavior to check access whenever search path is given
Changes for PC port
modified testing of DIRSEP to allow multiple possible values
added paths.h file to define DIRSEP and the like
fixed sloppiness on conditional compiles for UNIX
added macros for directory and path separation characters
added escape character for paths including colon
updated revision number for release 2.0
Initial revision
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