BUG: temporary changed the fitting also in flatten to ensure QA. There is still a bug in centreline computation.
BUG: temporary changed the fitting also in flatten to ensure QA. There is still a bug in centreline computation.

Former-commit-id: 150130fb1efb12ad5979feccce833fe9ac22c1e8 [formerly 2cc0af569b9105e46659cd45e037c60b7830a3c9]
Former-commit-id: 90f629791d7044121d36a0f8c54ddefb183041c1
Former-commit-id: b425252c289b860e08befbcc484abdeb450bbeff
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox