Some preparation work for doing async. activation. This amounts
	to another pass cleaning up the legendary "state machine" as well
	as some other cleanups in the async. activation code.

	* libnautilus-extensions/nautilus-bonobo-extensions.h:
	* libnautilus-extensions/nautilus-bonobo-extensions.c:
	(oaf_activation_callback), (nautilus_bonobo_activate_from_id),
	(nautilus_bonobo_activate_cancel): Fix interface of activation to
	be cleaner. Also handle case where callback is called right away.

	Add queuing to NautilusView so that all incoming CORBA calls are
	dispatched at idle time. This can fix some otherwise-difficult
	re-entrancy problems. The widget destroy call can still come in at
	any time though. Also this same fix may be needed for the
	NautilusViewFrame side.

	* libnautilus/nautilus-view.h:
	* libnautilus/nautilus-view.c: (execute_queued_calls): Function
	to dequeue and execute calls.
	(dequeue_calls_at_idle): Cover to call it at idle time.
	(discard_queued_calls): Discard calls without executing them, for
	use at destroy time.
	(queue_incoming_call): Simple cover to queue and schedule an
	idle-time dequeue pass.
	(nautilus_g_list_from_uri_list): Need to make a full copy, not
	a shallow copy, now that we are queuing things for a hile.
	(call_load_location), (call_stop_loading),
	(call_selection_changed), (call_title_changed),
	(call_history_changed): Simple functions that get queued.
	(list_deep_free_cover): GDestroyNotify-compatible function for one
	destroy case.
	(history_dup): Function to copy the history list, since that is
	now queued instead of used right away.
	(impl_Nautilus_View_load_location),
	(impl_Nautilus_View_stop_loading),
	(impl_Nautilus_View_selection_changed),
	(impl_Nautilus_View_title_changed),
	(impl_Nautilus_View_history_changed): Change these all to queue
	the incoming call instead of doing work right away.
	(nautilus_view_destroy): Discard the queue.

	* src/nautilus-view-frame-corba.c:
	(impl_Nautilus_ViewFrame_open_location_force_new_window),
	(impl_Nautilus_ViewFrame_report_selection_change): These calls now
	use the deep copy, since the shallow one is no longer available.
	This is good since we probably will be doing queuing here later,
	so we'll need the deep copy.

	* src/nautilus-view-frame.h:
	* src/nautilus-view-frame.c:
	(nautilus_view_frame_initialize_class): Set up a map default signal
	handler to activate the control. This is better than the old way,
	where we had an explicit call to do it.
	(nautilus_view_frame_destroy_client): Remove unused
	CORBA_Environment.
	(view_frame_activated): Remove unneeded ACTIVATING state. Also
	send the client_loaded signal in here, so you can't "forget".
	(view_frame_wait), (view_frame_underway),
	(view_frame_wait_is_over), (view_frame_loaded),
	(view_frame_failed): Remove unneeded ACTIVATING state.
	(check_if_view_is_gone): Simplify logic and make sure to check the
	value of the exception and not just the function result.
	(attach_client): Fix CORBA_Exception that was allocated twice and
	that could also be allocated and not freed in some cases.
	(activation_callback), (nautilus_view_frame_load_client_async):
	Better names, use new API, still not tested.
	(nautilus_view_frame_load_client): Get rid of function result and
	use unified interface for telling about success and failure so that
	sync. and async. interfaces will be the same.
	(nautilus_view_frame_stop): Renamed this single function, which
	will soon stop either activation that's in process or loading
	that's in process with a single call. For now it's just the same
	as the old stop_loading call.
	(nautilus_view_frame_map): New override to activate the control.
	This replaces the old explicit activate call.
	(send_history), (nautilus_view_frame_get_is_underway): Remove
	unneeded ACTIVATING state.

	* src/nautilus-window.h:
	* src/nautilus-window-manage-views.c:
	(location_has_really_changed): Assume that new_content_view is not
	NULL. The old code was trying to be inappropriately "general".
	(disconnect_destroy_unref_view): Remove now-unused function.
	(load_content_view): Don't use a return value any more, since it's
	important to set up new_content_view before any signals happen.
	Get rid of code that handles failure right at the start, since
	we now get all failures through the signal handler.
	(handle_view_failure): Add FIXME comments. Minor refactoring.
	(cancel_location_change): Eliminated now-uneeded views_shown and
	view_bombed_out booleans.
	(load_view_for_new_location): New load_content_view doesn't return
	a value any more.
	(update_state): Changed this to be a loop instead of returning a
	boolean and always being called in a loop. Also simplified logic
	so that views_shown and view_bombed_out aren't needed any more.
	(nautilus_window_end_location_change_callback): Use update_state
	directly instead of calling the old clunky change_state cover.
	(nautilus_window_begin_location_change): Use update_state directly
	instead of calling the old clunky change_state cover.
	(stop_loading): Call the new simple nautilus_view_frame_stop
	instead of nautilus_view_frame_stop_loading.
	(natuilus_window_stop_loading): Use update_state directly instead
	of calling the old clunky change_state cover.
	(nautilus_window_set_content_view): Use update_state directly instead
	of calling the old clunky change_state cover.
	(nautilus_window_set_sidebar_panels): Handle failures with
	callback instead of looking at return value (which no longer
	exists).
	(client_loaded_callback): Add this new callback that's done when
	the view is activated and ready to go.
	(failed_callback): Use update_state directly instead of calling
	the old clunky change_state cover.
	(load_underway_callback): Use update_state directly instead of
	calling the old clunky change_state cover.
	(load_complete_callback): Use update_state directly instead of
	calling the old clunky change_state cover.

	* src/nautilus-window.c:
	(nautilus_window_set_content_view_widget): Get rid of explicit
	activation, no longer needed now that NautilusViewFrame handles it
	directly.

	* test/test-nautilus-async-activation.c: (activation_callback),
	(main): Change to use new async. API.

	* user-guide/gnufdl/.cvsignore: Add to ignore some missing files.