Print header and field values in a readable format.

def _prt_line_detail(self, prt, values, lnum=""):
        """Print header and field values in a readable format."""
        #### data = zip(self.req_str, self.ntgafobj._fields, values)
        data = zip(self.req_str, self.flds, values)
        txt = ["{:2}) {:3} {:20} {}".format(i, req, hdr, val) for i, (req, hdr, val) in enumerate(data)]
        prt.write("{LNUM}\n{TXT}\n".format(LNUM=lnum, TXT="\n".join(txt)))