FIX: Possible crashes with aircraft with faulty routes on occasions (have not fixed the faulty routes themselves)
FIX: Passengers, mail and goods would walk/be hand-hauled to their ultimate destination if any intermediate stop was in walking distance of their ultimate destination, even if a further transport link would get them there more quickly.
Merge branch '11.x' into passenger-generation
FIX: Properly set passengers to be destined to a factory as appropriate so that they record properly on arrival.