* Implemented ban-capabilities, a first step towards an admin-friendly user
  system:
   - you can add and remove wild-carded e-mails from the banlist.
   - you can add and remove wild-carded hostnames from the banlist.
   - you can add and remove wild-carded usernames from the banlist.
   - you can add and remove wild-carded profanity from the banlist.
   - you can browse all bans according to their category: see ban.php.