Actual behavior:
Selecting some right-click context menu action of a data node in the datamanger does not perform any action or leads to a crash of the MITK workbench.
Some do not work, because the datamanager has not been set before (e.g. QmitkCreateMultiLabelSegmentationAction, QmitkConvertToMultiLabelSegmentationAction).
QmitkStatisticsAction does not work, because it doesn't exist anymore.