OPT: changed back from nurds smoothing to touati's smoothing
OPT: changed back from nurds smoothing to touati's smoothing

Former-commit-id: f3fea5a4223684e2bfda96340a3e3971436e3d0c
Former-commit-id: 5bd5731ec193670ed0c46592a3ef55246d0c23f2
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox