programs associated with file.

	* libnautilus-extensions/nautilus-mime-actions.c
	(nautilus_mime_get_short_list_applications_for_uri,
	nautilus_mime_get_short_list_components_for_uri): Implemented
	properly with metadata checking, etc.
	(gnome_vfs_mime_application_has_id,
	gnome_vfs_mime_id_matches_application,
	gnome_vfs_mime_id_matches_component,
	gnome_vfs_mime_application_has_id_not_in_list,
	component_has_id_in_list, string_not_in_list): Helper functions
	for g_list_find_custom and g_list_partition calls.