REF: added deprecated option in msct_registered_landmarks. Improved retrocompatibility with other scripts
REF: added deprecated option in msct_registered_landmarks. Improved retrocompatibility with other scripts

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