* idl/nautilus.idl: Added stop_location_change method to NautilusView interface.
	* ntl-view-client.c, ntl-view-client.h (stop_location_change): New
	signal, triggered on receipt of stop_location_change request via
	CORBA.

	* ntl-view.c, ntl-view.h, ntl-view-private.h, ntl-view-nautilus.c,
	ntl-view-bonobo-control.c, ntl-view-bonobo-subdoc.c
	(nautilus_view_stop_location_change): Added this function; also
	added implementation to nautilus view type function table and
	NULL'd out for now for Bonobo control and subdoc view types (need
	to find out if loading is synchronous or asynchronous for those,
	and if there is a way to abort).

	* ntl-window.c: Stop loading for all views when Stop button is
	pressed.

	* ntl-window-msgs.c: Enable stop button when we start loading;
	enable Stop button when

	* src/file-manager/fm-directory-view.c: Call
	request_progress_change() when loading is done or an error is
	reached; implement handler for stop_location_change signal.