- * Unlinks any pre-existing record file.
- *
- * Thing (action) definitions read in from server config directory are not
- * affected. The map is populated accordingly. world.turn is set to 1, as is
- * world.do_update, so that io_round() is told to update the worldstate file.
+ * The map is populated according to world.thing_types start numbers. world.turn
+ * is set to 1, as is .exists and .do_update, so that io_round() is told to
+ * update the worldstate file. Returns 0 on success, and if the world cannot be
+ * generated 1 since there is no player type or it has .n_start of 0, 2 if no
+ * "wait" thing action is defined.