The PedestrianLoadingStrategyPotentialDifference calculates an individual laoding for each body of the floor based on target potential differences. The central idea is to calculate the potential difference on a potential field the body doesnt use. The value is a measure of the repulsion effect of this body with respect to all pedestrians that uses the potential field that uses this laoding strategy. A negative potential difference indicates that the body does not move towards the target, so the laoding should be higher. If the potential difference is zero the body does not move. The Problem is that a negative potential difference on the static potential field does not necesserely mean that the pedestrian disturbs. On the dynamic field on the other hand we have no well defined measurement. So we try to combine the informations. The dynamic field gives the indication that the movement is disturbing (if the potential difference is negative on the dynamic field) or is not disturbing (if the potential is positive). The static field gives the us the measurement. // TODO [priority=medium] [task=refactoring] Remove this class