[mythtv] [PATCH] Allow channel changes across inputs on the same card.

[J. Donavan Stanley]

This patch allows for channel changes across inputs on the same card.  
Currently one needs to change the input first than change the channel.  
With this patch, if the initial query in checkChannel fails it will 
widen it's search to include other inputs on the same card. If that 
check succeeds then setChannelByString will use 
ChanelBase::SwitchToInput and return.

Now that combining my sat and antenna feeds is easier I need to find a 
better indoor antenna...
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