Travel::Status::DE::IRIS v1.23

Ignore apparently useless "ZOB" (central omnibus station) links at most main stations. This decreases the average runtime and also fixes some S-Bahn trains being reported twice in München Hbf.
Result->qos_messages: Skip superseded messages. They're still present in ->messages.
Result->route_interesting: Filter Hbf suffixes (not just "Hbf"); include .hl.n (czech main station).