Modified setup of poweredByLink so that plugins can disconnect click triggering aboutDialog.show(). Apparently the _only_ way to disconnect an onclick set up by dojo is to explicitly call dojo.connect and keep the returned value as a handle.  See: http://stackoverflow.com/questions/1214624/how-do-you-remove-a-dojo-connected-event-if-you-do-not-have-the-handle-that-wa
What the hell Dojo?
Trying to get better handle on menubar items by tagging with extra class based on menuName