Tie domains and databases together

[floyd]

It would be nice if domains and databases were tied together in some way even if were just a file for each database that showed which domains used it. That way when a user deleted a domain he could be given the choice to delete the database as well. He could also be warned if other domains were using the database. When creating a database he could be asked which domain is going to use it. Installatron and any other script installer would also have to edit this file since it creates databases in behalf of the user.