BUG: Don't make qMRMLLabelComboBox a container in Qt Designer

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21916 3bd1e089-480b-0410-8dfb-8563597acbee
ENH: Add qMRMLLabelComboBox::currentColorName

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21917 3bd1e089-480b-0410-8dfb-8563597acbee
BUG: Fix volume rendering of lut

A slight offset was added to labels in Volume Rendering.
This was visible when having lots of labels.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21918 3bd1e089-480b-0410-8dfb-8563597acbee
ENH: Add convenient function vtkSlicerVolumesLogic::SetVolumeAsLabelMap

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21919 3bd1e089-480b-0410-8dfb-8563597acbee