Next I'll change the actual metafile access to work that way.

	* libnautilus/nautilus-directory.h:
	* libnautilus/nautilus-directory.c:
	(nautilus_directory_metadata_call_when_ready): Added function
	that requests a read of some metadata and calls back when the
	data is ready.

	* src/ntl-app.c: (nautilus_app_startup): Got rid of call to
	nautilus_navinfo_init.

	* src/ntl-types.h: Moved the NautilusNavigationInfo struct
	and related defines to ntl-uri-map.h.

	* src/ntl-uri-map.h:
	* src/ntl-uri-map.c:
	Reformatted and changed the names of many functions.
	Added code to use the new metadata callback.

	* src/ntl-index-panel.c:
	* src/ntl-main.c:
	* src/ntl-view.h:
	* src/ntl-window-msgs.c:
	* src/ntl-window.c:
	* src/ntl-window.h:
	Had to change includes a bit because of my changes to what
	header files are including.

	* src/ntl-window-msgs.c: (nautilus_window_update_state):
	* src/ntl-window.h:
	Use the new nautilus_navigation_info_cancel call instead of
	reaching right in to cancel the underlying call.

	* src/ntl-view-private.h:
	Reformatting.