Dev/step size adjuster
Replacing the SpeedAdjuster of the GroupModel by a StepSizeAdjuster and change the potential calculations such that they did not depend on the geometric centroid.
2.12.2021, 9:00 - 11:00: Due to updates GitLab may be unavailable for some minutes between 09:00 and 11:00.
Replacing the SpeedAdjuster of the GroupModel by a StepSizeAdjuster and change the potential calculations such that they did not depend on the geometric centroid.