DEV : Added scad_validation.py in dev/sct_detect_spinal_cord
DEV : Added scad_validation.py in dev/sct_detect_spinal_cord

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