[mythtv-users] Asking before upgrading the schema

[Greg Estabrooks]

> Another approach might be to only allow backends to upgrade the  
> database or, even better, a master BE.

 Having a backend only do it might be one approach. Especially if the frontend
just kicks out a Error popup saying "This frontend is for a newer/Older
version of the database, please correct this before running mythfrontend" 
and then exiting.