[Owncloud] Setting up owncloud with PostgreSQL

[Michael Gapczynski]

> No I created a simple user with all privileges on the owncloud
> database (but not able to create new database).
> But it seems that there is a connection problem before even trying to
> modify anything in the database but I had no error in the logging
> file, only on the screen.
>

The user has to be a superuser because the setup tries to create a new 
database. If it the database is already created it will throw an error (I'll 
look into preventing that), but it should still create the tables without a 
problem.

I'll work on returning better error messages during the setup for PostgreSQL. 


Michael