IM cleanup on 1.0.x branch:

* Fake_XMPP back to Queued_XMPP, refactor how we use it and don't create objects and load classes until we need them.
* fix fatal error in IM settings while waiting for a Jabber confirmation.
* Caching fix for user_im_prefs
* fix for saving multiple transport settings
* some fixes for AIM & using normalized addresses for lookups

classes/User_im_prefs.php

@@ -68,4 +68,27 @@ class User_im_prefs extends Memcached_DataObject
     {
         return array(false,false);
     }
+
+    /**
+     * We have two compound keys with unique constraints:
+     * (transport, user_id) which is our primary key, and
+     * (transport, screenname) which is an additional constraint.
+     * 
+     * Currently there's not a way to represent that second key
+     * in the general keys list, so we're adding it here to the
+     * list of keys to use for caching, ensuring that it gets
+     * cleared as well when we change.
+     * 
+     * @return array of cache keys
+     */
+    function _allCacheKeys()
+    {
+        $ukeys = 'transport,screenname';
+        $uvals = $this->transport . ',' . $this->screenname;
+
+        $ckeys = parent::_allCacheKeys();
+        $ckeys[] = $this->cacheKey($this->tableName(), $ukeys, $uvals);
+        return $ckeys;
+    }
+
 }