NEW: added functions to pass from pix coordinates to phys coordinates and vice versa
NEW: added functions to pass from pix coordinates to phys coordinates and vice versa

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