ENH: output_modulated_tpms: flag to tell if user wants modulated TPMs to be produced
ENH: factorized / simplified prototype of do_subjects_preproc(...) function
BF: dartel flag not well propagated
BF: dartel flag not well propagated
ENH + BF: sanitized the way params get propagated in pipeline
ENH + BF: sanitized the way params get propagated in pipeline (revisited)
BF: casting voxel sizes to type typle
BF: multiple values for output_dir in _do_subjects_dartel
BF: incorrect reading of voxel sizes from .ini file
more
BF: multiple tiny bugs
BF: *voxel_size -> *voxel_sizes (otherwise, value is never propagated through pipeline,
    leading to incorrected output file resolution)
BF: multiple tiny bugs