[mythtv] [patch] Channel visible indicator

[Kevin Kuphal]

This patch adds a field to the channel record in the DB for "visible" and
modifies the channel selection in the EPG to only show visible channels.
This is the beginnings to support an easy way to configure which channels
show up in the EPG without having to modify the XMLTV files or mess with
deleting rows from the DB.  By hiding the channel, the data is still filled
so if later a change is made where you wish to start using that channel
again, it is an instantaneous toggle.  This is very similar to how the
ReplayTV handles unwanted channels and it seems to work very well for me on
that platform.

Next step obviously is to add a section to the TV setup for checking
channels on and off but I'm not that far with Qt yet to submit that so this
starts the process.

Kevin
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