Get associations for all stored species taxid2asscs[taxid][ID2GOs|GO2IDs].

def get_id2gos_all(taxid2asscs_a2b):
        """Get associations for all stored species taxid2asscs[taxid][ID2GOs|GO2IDs]."""
        id2gos_all = {}
        for a2b in taxid2asscs_a2b.values():
            for geneid, gos in a2b['ID2GOs'].items():
                id2gos_all[geneid] = gos
        return id2gos_all