OPT: register_to_template: changed smoothing from 3mm to 1.5mm
OPT: register_to_template: changed smoothing from 3mm to 1.5mm

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