[0828] - Atiesh, Greatstaff of the Guardian

* You should now be able to summon (and use) a portal to the area of Karazhan with Atiesh, Greatstaff of the Guardian.
  Model ID 6831 (the current model) wasn't present back in vanilla, so regarding http://img.photobucket.com/albums/v47/devinguy/atiesh6.jpg, the one from UC's portal was used.

  Thanks to evil-at-wow and trulynullified.

  This targets: https://github.com/classicdb/database/issues/664