Added three new DAs: directionSplice, symbolSplice and DistanceSplice.
These will present the correct answer to the user after the system tried
the respective pump DA.. so if the user gets direction wrong, first he
will be offered directionToolPump. If he still gets it wrong, he is
given directionPump ('which direction is north east'). If he still gets
it wrong, he is given directionSplice ('North east is this way'). This
utterance should ideally be accompanied by an arrow towards north east
displayed at the center of the map.