Fix bug 5235 ("Forget History" eliminates history from Go menu,
	not History sidebar panel).

	* components/history/nautilus-history-view.c:
	(install_icons): Fix leak of pixmap and bitmap.
	(update_history): Replaced dual lock system with a single one.
	(button_press_callback): Only respect button 1, ignore others.
	(button_release_callback): Only respect button 1, ignore others,
	(history_changed_callback): A new single callback for when the
	history list changes to replace the multiple callbacks before.
	(nautilus_history_view_initialize_class),
	(nautilus_history_view_initialize),
	(nautilus_history_view_destroy), (main): Change the history view
	to use nautilus_view_standard_main which requires a subclass. This
	gets rid of a lot of boilerplate code.

	* libnautilus/nautilus-view-component.idl: Make every NautilusView
	get an explicit history_changed call instead of requiring them to
	guess when to get history. Removed the old get_history_list call
	and a...