[vdr] Disabling EPG update from air or shift it in time

[user.vdr]

> The use is simple, show more information for programs. Many sities of the
> channels provide that information already, including pictures and movie
> trailers. There is also IMDB that can be used. As an example, MythTv has a
> nice use of IMDB for stored movies.
> Same can be implemented for live movies as well.

I always thought it would be cool if VDR was able to pull a
poster/cover and IMDB summary of movies but I doubt we'd see that in
vdr core.  A plugin maybe.  I'd think a cache somewhere would be far
more effecient then using epg.data for that though.