* glom/application.[h|cc]: Removed unused on_menu_add_record().
* glom/mode_data/box_data_portal.[h|cc]: On Maemo, add a Hildon::Button
to the application's AppMenu on realize, removing it on unrealize.
Added a virtual do_add_record() that is called when the button is clicked.
* glom/mode_data/box_data_calendar_related.[h|cc]:
* glom/mode_data/box_data_list_related.[h|cc]: Added do_add_record()
overrides, though they are empty so far.