BUG: msct_register_landmarks: homogenized variable names and fixed input param bug within subfunction
BUG: msct_register_landmarks: homogenized variable names and fixed input param bug within subfunction

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