Result: Document new addition/cancellation accessors

DateTime(3pm) object for the arrival date and time. undef if the

train starts here. Contains realtime data if available.

=item $result->arrival_is_additional

True if the arrival at this stop is an additional (unscheduled) event, i.e.,

if the train started its journey earlier than planned.

=item $result->arrival_is_cancelled

True if the arrival at this stop has been cancelled.

=item $result->arrival_wings

Returns a list of references to Travel::Status::DE::IRIS::Result(3pm) objects

DateTime(3pm) object for the departure date and time. undef if the train ends

here. Contains realtime data if available.

=item $result->departure_is_additional

True if the train's departure at this stop is unscheduled (additional), i.e.,

the route has been extended past its scheduled terminal stop.

=item $result->departure_is_cancelled

True if the train's departure at this stop has been cancelled, i.e., the train

terminates here and does not continue its scheduled journey.

=item $result->departure_wings

Returns a list of references to Travel::Status::DE::IRIS::Result(3pm) objects

may not be up-to-date) and generic information such as missing carriages or

broken toilets.

=item $result->is_additional

True if the train's arrival and departure at the stop are unscheduled

additional stops, false otherwise.

=item $result->is_cancelled

True if the train was cancelled, false otherwise. Note that this does not