[mythtv] status of MythTV wrt Coverity Scan

[Eric Sharkey]

> It might take a while before the results are available...

Results are available now.  All in all it looks pretty clean, with
only 994 defect reports.

Dakshesh pointed out a systematic false positive pattern because
Coverity does not know by analyzing the MythTV sources that the Qt
function quit() does not return and suggested a few ways to work
around this, but I think it's better to poke around and take a look at
what's there now, with the knowledge that there are ways to make it
better.

I'll be sending login information to individuals shortly.

Eric