Combine GO object fields and format_txt.

def __init_go2nt_dflt(self, gos_all, prt_flds_all):
        """Combine GO object fields and format_txt."""
        go2nts = [self.gosubdag.go2nt, self._get_go2nthdridx(gos_all)]
        go2nt = get_dict_w_id2nts(gos_all, go2nts, prt_flds_all)
        return self._init_go2nt_aug(go2nt)