6222 libuutil could provide a way to re-create an AVL tree

*** 54,63 ****
--- 54,64 ----
          uu_avl_node_init;
          uu_avl_numnodes;
          uu_avl_pool_create;
          uu_avl_pool_destroy;
          uu_avl_prev;
+         uu_avl_recreate;
          uu_avl_remove;
          uu_avl_teardown;
          uu_avl_walk;
          uu_avl_walk_end;
          uu_avl_walk_next;