ATAPI audio

[Jason Downs <downsj_(_at_)_teeny_(_dot_)_org>]

The acd driver in the source tree now supports audio.  It seems to be working, 
but it still needs some more cleaning up.

This is due to Manuel's 5th patch release, and I'll copy the relevant bit
from his announce:

	- integration of Milton Ngan's patch, which provide audio command support.

I had to make some considerable changes, though.

At any rate, our version of acd is pretty well diverged from Manuel's, now.
Please send bugs to me instead of him from this point onward; I'll forward
on anything relevant to him.

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