OPT: now put everything that is outside of warping field space to 0
OPT: now put everything that is outside of warping field space to 0

Former-commit-id: 496077c33e446373fd027bb9c761098b244fea14 [formerly 43861fdac3d0b79fad6a357b4884734d49d8cc81]
Former-commit-id: 4690a8859c0fdc3d7a09fb5242af8905b906449d
Former-commit-id: 5d236681a0558649fcd4f6527ac82ccfbbef1a9f
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox