storing ICON_X and ICON_Y.

	Take first step in moving the directory view to use the opaque
	NautilusDirectory and NautilusFile instead of using gnome-vfs
	directly. This will separate the controller from the model:
	FMDirectoryView is a controller and NautilusDirectory a model.

	* src/file-manager/fm-directory-view-icons.c:
	(add_to_icon_container):
	(fm_directory_view_icons_icon_moved_cb):
	Store icons positions as "x,y" in ICON_POSITION instead of storing
	separate numbers in ICON_X and ICON_Y.

	* libnautilus/nautilus-directory.h:
	libnautilus/nautilus-directory.c:
	(nautilus_directory_get_uri):
	Added a new call needed to replace fm_directory_view_get_uri.
	(nautilus_directory_get_file_metadata):
	(nautilus_directory_set_file_metadata):
	(nautilus_file_get_metadata):
	(nautilus_file_set_metadata):
	Moved the calls for getting and setting file metadata into the
	file objects.
	(nautilus_directory_new_file):
	(nautilus_file_get_info):
	Added temporary interfaces for the current situation where we're
	dealing with both NautilusFile and GnomeVFSFileInfo objects at
	once.
	(nautilus_directory_finalize):
	Detach and unref all the files when the directory is destroyed.
	(nautilus_file_unref):
	(nautilus_file_get_name):
	Implemented these functions now that we are using them.

	* src/file-manager/fm-directory-view.h:
	src/file-manager/fm-directory-view.c:
	(fm_directory_view_add_entry):
	(fm_directory_view_activate_entry):
	(display_selection_info):
	(fm_directory_view_get_selection):
	src/file-manager/fm-directory-view-icons.c:
	(add_to_icon_container):
	(fm_directory_view_icons_icon_moved_cb):
	(dm_directory_view_icons_add_entry):
	(fm_directory_view_icons_get_selection):
	(icon_container_activate_cb):
	src/file-manager/fm-directory-view-list.c:
	(add_to_flist):
	(fm_directory_view_list_add_entry):
	Change all the code to work with NautilusFile instead of
	GnomeVFSFileInfo, except for the parts of FMDirectoryView dealing
	with the directory_list.

	* src/file-manager/fm-directory-view.h:
	src/file-manager/fm-directory-view.c:
	(nautilus_file_date_as_string):
	(nautilus_file_size_as_string):
	(nautilus_file_type_as_string):
	libnautilus/nautilus-directory.h:
	libnautilus/nautilus-directory.c:
	(nautilus_file_get_date_as_string):
	(nautilus_file_get_size_as_string):
	(nautilus_file_get_type_as_string):
	Moved and renamed these functions and made them work on
	NautilusFile objects.