Cloning toolbar edit group

By cloning a single cached instance of the edit group widget,
jQuery widget initialization can be circumvented.

Change-Id: I61d9f2fce50499a753a00c4c6dbb876df5d55883
jQuery.wikibase.entityselector: Reposition menu when refreshing

(requires change Iced14408763658e9c92fe2eb65e7e66ea5c5e000)

Change-Id: I7d548bfef0887cdd2ef1b694cdea01886e6ee415
Merge changes I7d548bfe,I61d9f2fc

* changes:
  jQuery.wikibase.entityselector: Reposition menu when refreshing
  Cloning toolbar edit group