* src/file-manager/fm-directory-view.c,
	src/file-manager/fm-directory-view.h
	(fm_directory_view_set_selection): New function.
	(set_selection): New virtual method that must by implemented by
	subclasses.
	(add_nautilus_file_to_uri_map, remove_nautilus_file_from_uri_map,
	free_file_by_uri_map_entry, free_file_by_uri_map): New functions
	to manage a hash table mapping from uri strings to NautilusFile
	objects.
	(notify_selection_change_cb): New function; on a selection change
	notification, either set the selection immediately if the view has
	completed loading, or establish it as pending.
	(display_pending_files): Maintain the uri -> file hash table on
	notifications from the model; do any pending selections required
	when loading completes.

	* src/file-manager/fm-list-view.c (fm_list_view_set_selection):
	New function to implement `set_selection' virtual method.

	* src/file-manager/fm-icon-view.c (fm_icon_view_set_selection):
	New function to implement `set_selection' virtual method.

	* libnautilus/nautilus-list.c (nautilus_list_set_selection): New
	function: set the selection to a specified set of rows.

	* libnautilus/nautilus-icon-container.c,
	libnautilus/nautilus-icon-container.h
	(nautilus_icon_container_set_selection): New function: set the
	selection to a specified set of icons.