Finish fixing bug 6286 (need to re-apply optimization where we do
	a single directory load):

	* src/nautilus-window-manage-views.c: (begin_location_change): Do
	the force_reload work in here. We want it on all 4 kinds of
	location change (forward, back, new location, reload). Other
	browsers don't do reload on back, so we may want to change this at
	some point.
	(nautilus_window_reload): Remove the old code to invalidate from
	here now that it's done in begin_location_change.

	* src/file-manager/fm-directory-view.c: (load_location_callback),
	(load_directory), (finish_loading), (filtering_changed_callback):
	Remove the old code to do force_reload. The NautilusDirectory part
	of triggering a reload is now handled by the shell.

	* libnautilus-extensions/nautilus-directory.h:
	* libnautilus-extensions/nautilus-directory.c:
	(nautilus_directory_file_monitor_add): No force_reload parameter
	any more.
	(nautilus_directory_force_reload): New separate call used to forc...