NEW: add -ratio flag to compute the GM/WM CSA ration, by slice or by vertebral level
NEW: add -ratio flag to compute the GM/WM CSA ration, by slice or by vertebral level

3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox