OPT: create links now rm sct_nurbs, sct_utils & sct_segmentgreymatter
OPT: create links now rm sct_nurbs, sct_utils & sct_segmentgreymatter

Former-commit-id: 20288aedbeb26bbd1650bd5128d5d69ad2838b7b
Former-commit-id: 0cc3ea49e1731e0ff9914cefc78581f482fa15d2
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox