[mythtv] Backend AutoDiscovery

[Nigel Pearson]

>> 7) Myth themed UI stuff.
>
> Can't agree more!  The current screens are ugly!  But, I tried this...
> chicken & egg problem.

Jeremiah and I faced the same problem with the mysql.txt stuff.
It bootstraps a "fake" database and theme (no key bingings, though).


When the other bugs are under control, I will look at combining
the AutoDiscovery chooser with the database settings.
Unless you beat me to it :-)

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