[mythtv] New MPEG2 commercial-cut code ready for testing

[Geoffrey Hausheer]

Here is mpeg2fix-0.9
it should fix the blockiness Cory reported, and a frame-corruption
issue I found, and has some other minor fixes, but I don't think it'll
fix anyone else's crashing or infinite-loop problems.  Unfortunately,
I'm mostly shooting in the dark on those, as I haven't been able to
reproduce them yet.

http://www.pblue.org/myth/mpeg2fix-0.9.tgz

.Geoff