dwiintensitynorm: use new population_template syntax, avoid copy of warps
dwiintensitynorm: use new population_template syntax, avoid copy of warps

MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3