Added support for photon-mapping (thanks to Roland)
Added check for -P* persist option to preclude running rpict
Added support for persist mode, which rtrace will complain about if -n > 1
Added check so we don't overwrite output files created in earlier run with -o*
Added check for missing @file
Additional quoting to protect spaces in octree and z-buffer file names
Moved -pd to ignored options where it belongs
Simplified -o with -z slightly
Made it so output names don't collide when rcode2bmp run on all
Added -o* option to rtpict
Add -o* option (and -d) to support layered image folders
Added rsplit tool to divide input to multiple output streams
Fixed issue with boolean option toggling (thanks to Axel Jacobs)
Added support for -z option (depth buffer output)
Added check if output picture exists with -o option to match rpict behavior
Removed rtpict from Windows build, while fixing quoting so it *could* run
Fixed issues with boolean arguments and miscellaneous
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