no muxing yet
no index yet
no seeking yet
libnuts crcs dont match mine (didnt investigate yet)
samplerate is stored wrong by libnut (demuxer has a workaround)
code is not clean or beautifull yet, but i thought its better to commit early before someone unneccesarily wastes his time duplicating the work
demuxer split from muxer

Originally committed as revision 6966 to svn://svn.ffmpeg.org/ffmpeg/trunk