ENH: Update to Testing::ComparisionImageFilter

Update deprecated usage of ComparisonImageFilter to
TestingComparisonImageFilter.

Migration:
http://itk.org/migrationv4/index.php?action=artikel&cat=3&id=113&artlang=en&highlight=ComparisonImageFilter

From: Bradley Lowekamp <blowekamp@mail.nih.gov>

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23651 3bd1e089-480b-0410-8dfb-8563597acbee
ENH: Update GetCoefficientImage to GetCoeffiecientImages

Function renamed, and only available with ITKv3 compatibility.

From: Bradley Lowekamp <blowekamp@mail.nih.gov>

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23652 3bd1e089-480b-0410-8dfb-8563597acbee