* components/tree/Makefile.am: Add VFS_CFLAGS

	* components/tree/main.c (main): Initialize more libraries.

	* components/tree/nautilus-tree-view.h,
	components/tree/nautilus-tree-view.c: Many changes. The upshot is
	that basic tree loading now works, but many details remain to be
	fleshed out (individual bugs were filed on these).

	* libnautilus-extensions/nautilus-directory-async.c:
	(dequeue_pending_idle_callback), (directory_load_done): Try to
	emit done signal exactly once when a monitor load is complete. But
	I think this might be questionable, see below.

	* libnautilus-extensions/nautilus-directory-private.h,
	libnautilus-extensions/nautilus-directory.h,
	libnautilus-extensions/nautilus-directory.c: Add the
	"done_loading" signal for when a load initiated by monitoring is
	done. I just realized this does the wrong thing when more than one
	thing is monitoring at the same time (both get the signal), so
	maybe it should be changed to a callback function passed to
	nautilus_file_monitor_add, but that would be harder to implement.

	(nautilus_directory_emit_done_loading): Function so the async code
	can emit it.