fate: simplify fft test rules
Signed-off-by: Mans Rullgard <email@example.com>
fate: add fixed-point fft/mdct tests
fate: move some groups of related tests to their own files
This moves some groups of tests for single codecs to separate files,and adds shorthands for running all tests in a group.
Originally committed as revision 24697 to svn://svn.ffmpeg.org/ffmpeg/trunk