SimpleITK e2ec6bbf Filter descriptions (reduced)

This tree was extracted from upstream SimpleITK by the following shell script:
  ./Utilities/UpdateFilterDescriptionsFromSimpleITK.sh
Merge branch 'sitk-upstream' into update-sitk
BUG: Remove filters which take ITK LabelMap as input

Slicer uses the term "label map" to indicate a label image, which is
difference then the ITK LabelMap image class. This is confusing and
misleading. Also these filter can't be used in Slicer to they are just
being removed.