Fixed language loading bugs and removed debug code.

* User language was not loaded directly after logging in.
* Default language was not loaded directly after logging out.
* Removed stupid debug code. Was there since 2011-Oct-5. Unnoticed.
  *sigh*
models.php now uses PDO (UNTESTED!)
Fixed PDO DSN.
setup now uses PDO
New dependencies
Merge branch 'replace-mysql-with-pdo' of git@github.com:kch42/ratatoeskr-cms.git into replace-mysql-with-pdo