code: def get_psms(self):
          
          self.header = actions.create_header(self.oldheader, self.spectracol)
          self.psms = actions.generate_psms_spectradata(self.lookup, self.fn,
                                                        self.oldheader)
docs: Creates iterator to write to new tsv. Contains input tsv
          lines plus quant data for these.