Document $status->related_stations

In case of a fatal HTTP request or IRIS error, returns a string describing it.

Returns undef otherwise.

=item $status->related_stations

Returns a list of hashes describing related stations whose

arrivals/departures are included in B<results>. Only useful when setting

B<with_related> to a true value, see its documentation above for details.

Each hash contains the keys B<uic> (UIC/EVA number; known as IBNR in Germany),

B<name> (station name), and B<ds100> (station code). Note that stations

returned by B<related_stations> are not necessarily known to

Travel::Status::DE::IRIS::Stations(3pm).

=item $status->results

Returns a list of Travel::Status::DE::IRIS::Result(3pm) objects, each one describing