[mythtv] A bunch of bug fixes

[Lawrence Rust]

Hi,

I have around 50 patches to various minor bugs that I've been using for
a while now.  They mainly cover the frontend and video playback.  None
of them are significant changes so I was hoping to commit them before
the 0.28 release.  Before I do so, I wanted to air them to ensure that
there are no serious gotchas.  So I've created a new branch:
devel/lvr/bugfixes.

Please let me know if you spot any problems or have any objections.

Thanks.

-- Lawrence Rust