2006-02-26  Zbigniew Chyla  <mail@zbigniew.chyla.pl>

	Get users' and groups' names via a cache to avoid calling
	getpwuid/getgrgid too often (i.e. many times during single redraw).

	* libnautilus-private/Makefile.am: (libnautilus_private_la_SOURCES):
	Added nautilus-users-groups-cache.[ch]
	* libnautilus-private/nautilus-users-groups-cache.[ch]: New,
	implementation of cache for getpwuid/getgrgid results.
	* libnautilus-private/nautilus-file.c:
	(get_user_name_from_id): removed
	(get_real_name): accept "name + gecos" pair instead of "struct passwd".
	(get_user_and_real_name_from_id): get user name and gecos using
	nautilus_users_cache_* functions instead of using getpwuid directly.
	(nautilus_get_user_names): adjusted to changed signature of get_real_name.
	(nautilus_file_get_group_name): get group name using
	nautilus_groups_cache_get_name instead of using getgrgid directly.
	(nautilus_file_get_owner_as_string): get user name using
	nautilus_users_cache_get_name.