Reverted SVN trunk back to revision 3938 to remove changes in default theme an a replacement of the ispconfig logo.

- fixed a php notice in app.inc.php

Disable spam and virus notifications for the admin user. Can be overridden by the policies in mysql.

2.) Cleaned up update.php
3.) Changed definitions for quarantine settings
4.) Commented out areas for quarantining 'clean' and 'other'