population_template: pre- and postfix changes
population_template: pre- and postfix changes

- warps and trafos: pre- and append suffixes common across subjects and input contrasts
- prefix and postfix parsing bufgix: replaced rstrip and lstrip with regular expressions
- more verbose error and info output regarding uid matching and pre- and postfix

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