OPT: output normalized MI
OPT: output normalized MI

Former-commit-id: ca104a8ca679896831f049eb443b11689bd6d6de
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox