-> Enabled partial updates to app widgets through AppWidgetManager.

   Partial updates are not cached by the AppWidgetService.
-> Added the ability to insert commands with no parameters into
   RemoteViews objects.
-> Added showNext() and showPrevious() methods to RemoteViews.
-> Made showNext() / showPrevious() of AdapterViewFlipper remotable.

Change-Id: Ic5491bb374424a54728c4ca92b94b1f00dfb87ff