OPT: developing groupwise registration of the target (work in progress)
OPT: developing groupwise registration of the target (work in progress)

Former-commit-id: 53b3f67c70991f8cac77e14aae65dcb7cf098959 [formerly f4bbaf88c2c5cff30332f44f4b599a718fddc6f1]
Former-commit-id: e053288c18394f1cd5481119a959da6f5442f258
Former-commit-id: 61a0c47180c0ab8ed4bfc868ee8fa14d4f1b6e99
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox