These were deprecated in 2012; just before the ITK 4.2 release.
ZeroValue() and OneValue() should be used instead.

-- This coforms to ITKv4 changes made in
    InsightSoftwareConsortium/ITK@6c23e1da
    InsightSoftwareConsortium/ITK@3f712cd0

When building with clang on 10.9 where ITKv4 is a shared library,
a linking error occured for unfound symbols: NumericTraits<
OutputPixelType >::Zero but using the
NumericTraits< OutputPixelType >::ZeroValue() allows linkage to occur properly.

From: Hans Johnson <hans-johnson@uiowa.edu>

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23857 3bd1e089-480b-0410-8dfb-8563597acbee