2D View (slicer) not updating after change of dateset position

[lukasbehammer]

The position of the dataset in the slicer is not updated, when the dataset position is update manually.

[codeling]

This is as currently intended: The slicer works in local (voxel) coordinates of the (first) volume dataset.

It would be a good idea to redesign the slicer to work based on global coordinates; this would require some UI redesign as well, since the current slice numbers (given in voxel coordinates of the first dataset) aren't really helpful in a global context.