...and drop the unnecessary &reference from child class pkeyGet() overrides.

classes/Group_inbox.php

@@ -20,7 +20,7 @@ class Group_inbox extends Memcached_DataObject
     /* the code above is auto generated do not remove the tag below */
     ###END_AUTOCODE
 
-    function &pkeyGet($kv)
+    function pkeyGet($kv)
     {
         return Memcached_DataObject::pkeyGet('Group_inbox', $kv);
     }