COMP:  Use C++11 nullptr directly
COMP:  Use C++11 nullptr directly

git grep -l "ITK_NULLPTR" |   fgrep -v itk_compiler_detection.h | fgrep -v CMakeLists.txt |fgrep -v .cmake |   xargs sed -i '' -e "s/ITK_NULLPTR/nullptr/g"

KitwareMedical/ITKStrain,KitwareMedical/ITKStrain