Print an ASCII text format.

def prt_tsv(self, prt=sys.stdout):
        """Print an ASCII text format."""
        prtfmt = self.objprt.get_prtfmt_str(self.flds_cur)
        prt.write("{FLDS}\n".format(FLDS=" ".join(self.flds_cur)))
        WrSectionsTxt.prt_sections(prt, self.desc2nts['sections'], prtfmt, secspc=True)