Move conf file generation into an interface; fixed a bug with missing use of deepcopy on the Function interfaces.
Move conf file generation into an interface; fixed a bug with missing use of deepcopy on the Function interfaces.

carlohamalainen/volgenmodel-nipype,NIF-au/volgenmodel-nipype,carlohamalainen/volgenmodel-nipype,carlohamalainen/volgenmodel-nipype,NIF-au/volgenmodel-nipype,carlohamalainen/volgenmodel-nipype,NIF-au/volgenmodel-nipype,NIF-au/volgenmodel-nipype