class_docstr: MultiSubjectParcellation class are used to represent parcels
  that can have different spatial different contours
  in a given group of subject
  It consists of
  self.domain: the specification of a domain
  self.template_labels the specification of a template parcellation
  self.individual_labels the specification of individual parcellations
  
  fixme:should inherit from mroi.MultiROI
docstr: Returns a copy of self
          
code: def copy(self):
      """Returns a copy of self"""
      msp = MultiSubjectParcellation(
          self.domain.copy(),
          self.template_labels.copy(),
          self.individual_labels.copy(),
          self.nb_parcel,
      )
      for fid in self.features:
          msp.set_feature(fid, self.get_feature(fid).copy())
      return msp
  
file_path: nipy/nipy/labs/spatial_models/parcellation.py
imports: from warnings import warn
  import numpy
label_desc: Use image node_id 2 for calling the MultiSubjectParcellation obj's underlying member method code with example usage: obj.copy() and returns: msp