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


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@6966 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b