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This should fix another high frequency polling loop, and fix the visual
update glitches when new data arrives.

This fixes unneccessary high frequency polling during a longer trip.

Most importantly, we now propagate the geo coordinates from that to
the reservations, which makes all location-based features work.

Necessary for a more clever auto-polling.

Also, make it less departure-centric, now that arrivals are handled here
too.

Yes, Departure still needs a better name...

This still misses proper change notification via the timeline model, so
it's not reacting to updates yet.

This only covers departures and not arrivals so far, and it doesn't do
anything with the results yet.