sensible things)

	* libnautilus-extensions/nautilus-gnome-extensions.h,
	* libnautilus-extensions/nautilus-gnome-extensions.c:
	(nautilus_info_dialog),
	(nautilus_info_dialog_parented): New functions for showing
	a one-button informational dialog.
	(nautilus_yes_no_dialog),
	(nautilus_yes_no_dialog_parented): New functions for
	showing a two-button question dialog.
	(show_yes_no_box): Helper function used to implement
	yes_no_dialog routines.

	* src/nautilus-bookmark-list.h,
	* src/nautilus-bookmark-list.c:
	(nautilus_bookmark_list_delete_items_with_uri):
	New function for deleting all bookmarks with a given uri.

	* src/nautilus-window-menus.c:
	(bookmark_holder_new), (bookmark_holder_free): New helper
	functions for dealing with BookmarkHolder structs.
	(remove_bookmarks_for_uri),
	(show_bogus_bookmark_window),
	(uri_known_not_to_exist): New helper functions for dealing
	with bookmarks for missing (local) files. In the Go menu
	case, the user is just told that the location doesn't exist;
	in the Bookmarks menu case, the user has the option of
	removing bookmarks with this URI from their list.
	(activate_bookmark_in_menu_item): Added a parameter to
	distinguish Go menu case from Bookmarks menu case.
	(append_bookmark_to_menu): Added this parameter here also,
	where it's stored in a BookmarkHolder; deploy
	bookmark_holder_new and	_free.
	(refresh_bookmarks_in_bookmarks_menu),
	(refresh_bookmarks_in_go_menu): Pass the new parameter to
	append_bookmark_to_menu.