code: def add_multiifo_output_list_opt(self, opt, outputs):
          
          # NOTE: Here we have to use the raw arguments functionality as the
          #       file and ifo are not space separated.
          self.add_raw_arg(opt)
          self.add_raw_arg(' ')
          for outfile in outputs:
              self.add_raw_arg(outfile.ifo)
              self.add_raw_arg(':')
              self.add_raw_arg(outfile.name)
              self.add_raw_arg(' ')
              self._add_output(outfile)
docs: Add an option that determines a list of outputs from multiple
              detectors. Files will be supplied as --opt ifo1:input1 ifo2:input2
              .....