After changing the handling of exterior/unlabeled labels (no explicit label instance any more), some tool do not work properly any more.
Can be seen e.g. with the Otsu tool.
# The result 0 cannot be selected anymore or transfered. Reason currently 0 (unlabeledValue) is always ignored. => we have to see if we let tools decide if they want to ignore 0. But for those who want not, the whole result must be shiftet (e.g. with transferLabelContent).
# If you have already a label with content. The content seems not to be overwritten, even if it should. Also if (e.g. in Otsu you first previewed with n (e.g. 4) regions and then reduce to n-1 regions. Still n labels are there, because the current transfer does no "removing" update. -> Revise the whole tranfer label and update preview strategy. Also needed for tools like nnUnet and TotalSegmentator