Carving: Preprocessing: Fix watershed source setting serialization.
Carving: Allow convenient subclassing of applet and gui.
DataSelection: Avoid crash during startup if not all slots are ready yet.
Carving: Replaced labeling operator with a dense labeling operator.
Added SplitBodyCarving applet and workflow.
Carving: Fixed a typo in 3D rendering context menu action.
Carving: Added a debug layer for the MST-cached 'raw' data.
Carving: Allow user to show current segmentation in the 3D view as he edits it.
Split-body Carving: Added a layer for "masked segementation" that shows the intersection of the segmentation with the mask.
StandardApplet: Minor API change to fix issues with 3-level subclass hierarchies.
Subclasses of StandardApplet that wish to provide their own multi-lane guis may override createMultiLaneGui(), not getMultiLaneGui(), which the base class must provide.
Carving: Eliminated OpCarvingTopLevel, the "outer" carving operator, which is no longer needed.
Also, simplified the way that the carving gui is created in carvingApplet.py