[mythtv] Remote file timeout.

[avalanche at beyondmonkey.com]

> As I was applying this, it occurred to me 'why not use QTime::start/elapsed 
> for this', as that seems to be a much simpler way to handle timeouts like 
> these.  Whaddya think of what I committed?

That was what I had at first too but then I remembered the 24h wrapping issues
with QTime and chickened out to QDateTime. I just tried it out since it's not 
clear from the QT docs: 
QTime::secsTo() will fall apart as soon as it passes midnight. 
QTime::start()/elapsed() however, work fine. 

So it's all good.

av