fix: (manually) moving TrackPoint + some comments
In MR !79 (merged) I added the MessageBox in the call to addManualTrackPoint, which is also used for moving TrackPoints, thus disallowing moves when selecting trajectories.
The MessageBox is now moved into addPoint and only appears, when a new point would have been added. If a point is moved, it's not shown/activated.
Closes #139 (closed)