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
fixed bug in -c option with -b
fixed Usage message to mention -n option
added Anthony Dekker's neural net color quantization code
fixed bug in read error handling
added -d option and made dithering the default
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