code: public final BusItineraryHalt addBusHalt(UUID id, BusItineraryHaltType type) {
  		return addBusHalt(id, null, type);
  	}
docs: Add a bus halt inside the bus itinerary.
  
  @param id is the identifier of the bus halt.
  @param type is the type of the bus halt.
  @return the added bus halt, otherwise <code>null</code>