3drefit does not accept -prefix option, since it operates on its own file
now it will work if you give the same out_file name as in_file name
however if you give no out filename it might not work if your
infile is a .nii or .nii.gz since afni will make briks
Merge pull request #563 from alexschaefer83/master

interfaces.afni 3drefit was not running