Marble: Unify handling of different MeasurementSystems
completed by: Ilya Kowalewski
mentors: Dennis Nienhüser, shentey, Torsten Rahn
In http://www.google-melange.com/gci/task/view/google/gci2014/5879562479075328 a new set of methods was introduced to handle measuresystem conversion in a more unified way.
Please create a patch which makes use of this method in all other places in Marble where it's helpful.