code: def get_nts_flat(self, hdrgo_prt=True, use_sections=True):
          
          # Either there are no sections OR we are not using them
          if self.sectobj is None or not use_sections:
              return self.sortgos.get_nts_sorted(
                  hdrgo_prt,
                  hdrgos=self.grprobj.get_hdrgos(),
                  hdrgo_sort=True)
          if not use_sections:
              return self.sectobj.get_sorted_nts_omit_section(hdrgo_prt, hdrgo_sort=True)
          return None
docs: Return a flat list of sorted nts.