* map.c (_new_map_create, _new_map_del_node, _new_map_del_node,
_new_map_set_int64, _new_map_set_str,_new_map_get_int64,
_new_map_get_str, _new_map_get_stat, _new_map_set_stat):
New internal functions for the new API.
* map-int.c (__stp_map_set_int64): Modify to return an
error code.
* map-stat.c (_stp_map_add_stat): Ditto.
* map-str (_stp_map_set_str): Ditto.
* Doxyfile: Remove predefines NEED_STRING_VALS,
NEED_STATS, NEED_INT64.
* map-keys.c: Ditto.
* list.c (_stp_list_new): Ditto. Also set map->list.
* map-values.c: Ditto.