STYLE: Improvements to ExpertAutomatedRegistration.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21694 3bd1e089-480b-0410-8dfb-8563597acbee
COMP: itkBSplineImageToImageRegistrationMethod unused variable.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21695 3bd1e089-480b-0410-8dfb-8563597acbee
COMP: itkImageToImageRegistrationMethod: shadowed method.

Warning occurs with switch to ITKv4.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21696 3bd1e089-480b-0410-8dfb-8563597acbee