[mythtv] PATCH Potential DataDirect icon solution

[Anduin Withers]

> Why would you need to export/import the icon map?

Because it is a static mapping that would need to be grown and shared to be
useful.

> Is this code like grab_icons_na from xmltv?

No, there is no grabbing involved, simply a static mapping of call sign to
network to icon location. The idea is to have some source that doesn't rely
on scraping zap2it for icon information. 

-- 
Anduin Withers