ENH: Import itkConstantImagePointerBoundaryCondition
ENH: Import itkConstantImagePointerBoundaryCondition

Imported from my PhD thesis work.

KitwareMedical/ITKUltrasound,thewtex/ITKUltrasound,KitwareMedical/ITKUltrasound,thewtex/ITKUltrasound,thewtex/ITKUltrasound,KitwareMedical/ITKUltrasound