code: def get_quantmap(consfile):
      
      quantmap = {}
      maplist = basereader.get_element(consfile, 'mapList')
      for mapitem in maplist:
          quantmap[mapitem.attrib['label']] = mapitem.attrib['id']
      return quantmap
docs: Returns map of isobaric quant channel names as keys, channel numbers
      values from consensus XML.
      E.g. {'113': '0',
            '114': '1',}