ENH: Update to ITK & new ANTS with partial FFTW fixes.
ENH: Syncronize with ITK new ExternalData.cmake
ENH: Update add SimpleITK to include recent fix.
STYLE: Change to be consistent with rest of build system.
STYLE: Make program follow conventions

This program did not build like the others, and
was in a different directory layout.
STYLE: Remove redundant code.
ENH: Make conditional build for when testing is used.