Get GO IDs header index for each user GO ID and corresponding parent GO IDs.

def _get_go2nthdridx(self, gos_all):
        """Get GO IDs header index for each user GO ID and corresponding parent GO IDs."""
        go2nthdridx = {}
        # NtHdrIdx Namedtuple fields:
        #   * format_txt: Used to determine the format when writing Excel cells
        #   * hdr_idx: Value printed in an Excel cell
        # shortcuts
        obj = GrouperInit.NtMaker(self)
        # Create go2nthdridx
        for goid in gos_all:
            go2nthdridx[goid] = obj.get_nt(goid)
        return go2nthdridx