GRAPHICS: Replace JPEG decoder with one coming from jpeg-compressor

jpeg-compressor is Public domain, Rich Geldreich <richgel99@gmail.com>

https://code.google.com/p/jpeg-compressor/
SVN revision 14 from May 20, 2012 was used for this code which
corresponds to jpeg-compressor v1.04

This effectively adds support for progressive JPEGs as well as some
obscuring colorspaces.