Write counts of GO terms at all levels and depths.

def wr_xlsx(self, fout_xlsx):
        """Write counts of GO terms at all levels and depths."""
        from goatools.wr_tbl import wr_xlsx
        kws = {
            'title' : self.title,
            'hdrs' :["Dep/Lev",
                     "BP Depth", "MF Depth", "CC Depth",
                     "BP Level", "MF Level", "CC Level"]}
        wr_xlsx(fout_xlsx, self.get_data(), **kws)