small fix +  use systematically nii instead of nii.gz
small fix +  use systematically nii instead of nii.gz

ins-amu/scripts,maedoc/scripts,maedoc/scripts,ins-amu/scripts,caiaAlexandra/scripts,timpx/scripts,caiaAlexandra/scripts,timpx/scripts,caiaAlexandra/scripts,caiaAlexandra/scripts,timpx/scripts,maedoc/scripts,ins-amu/scripts,maedoc/scripts,timpx/scripts,maedoc/scripts,timpx/scripts,ins-amu/scripts,caiaAlexandra/scripts