Updated rightBarButton on main screen so that it’s not created by code anymore.  I had to do this in order to make Settings show up as a popover.  It has to have an anchor.
Updated rightBarButton on main screen so that it’s not created by code anymore.  I had to do this in order to make Settings show up as a popover.  Also added NSNotification so Settings will notify main screen when it goes away and main screen will be updated.