Do not use PNG output with post_process.

There are some mistakes in the png_pov.c file.  Calling Open_Png_File for
READ_MODE does not do even close to what is expected.  It does a bunch of
stuff opening up temporary files and stuff like that, and ends up opening
the file for write instead of read (which totally messes things up).

If anybody has any ideas how to fix png_pov.c or knows how to contact the
author(s), please let me know.

-Nathan

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