Fixed bug 2327 (Alt-key combinations to show menus work on
	Desktop, but shouldn't)

	Had to abandon the old-Bonobo approach for this and make a
	new-Bonobo approach.

	* src/file-manager/nautilus-desktop-icon-view-ui.xml:
	Redefine all top-level menus' labels to be "" so there won't
	be any underline accelerator

	* src/nautilus-desktop-window.c: (nautilus_desktop_window_new):
	* src/nautilus-window-menus.c:
	(remove_underline_accelerator_from_menu_title),
	(nautilus_window_disable_keyboard_navigation_for_menus):
	* src/nautilus-window.h: Remove the old now-useless trick to
	do this.