REF: put back bval_min at 100 (more realistic)
REF: put back bval_min at 100 (more realistic)

Former-commit-id: 0f809780e61de942ee7bdfc6339527a85c01fdc8
Former-commit-id: b52736b508a69686497ae8c0849cf269d9dbbc8e
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox