tiny_psnr: skip wav headers on input files
The byte count printed excludes the header, and offsets are appliedafter the the headers are skipped.
Reference files updated to reflect new output. Some stddev/psnr valueshave changed slightly due to headers no longer being compared....
tiny_psnr: print max absolute difference between files
Regression test reference updates are due to the extra outputfrom tiny_psnr.
Patch by Vitor Sessak
Originally committed as revision 24132 to svn://svn.ffmpeg.org/ffmpeg/trunk
Place regression test output files in subdirs per family
Originally committed as revision 22155 to svn://svn.ffmpeg.org/ffmpeg/trunk
Separate audio-only tests so they are only run once
Originally committed as revision 21556 to svn://svn.ffmpeg.org/ffmpeg/trunk