[mythtv] [patch] NuppelVideoPlayer cleanup

[Daniel Thor Kristjansson]

This is the last in the series of exit cleanup patches for a while. I'm 
tackling ffmpeg next, and expect that to take some time. This is the 
biggest of the series as well, it removes premature exit()'s from the 
player and aborts the playing instead with an informational dialog for 
the user. It adds a errored variable to NVP and the videoout classes as 
well. If an error is encountered in either the NVP errored variable is 
set and the player is shut down. I think I got this right, but this 
patch needs review the most of all the cleanup patches as it's slightly 
more complex.

-- Daniel
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