Print annotation/evidence code summary.

def prt_summary_anno2ev(self, associations, prt=sys.stdout):
        """Print annotation/evidence code summary."""
        ctr = cx.Counter()
        for ntanno in associations:
            evidence_code = ntanno.Evidence_Code
            if 'NOT' not in ntanno.Qualifier:
                ctr[evidence_code] += 1
            elif 'NOT' in ntanno.Qualifier:
                ctr["NOT {EV:3}".format(EV=ntanno.Evidence_Code)] += 1
            else:
                raise Exception("UNEXPECTED INFO")
        self.prt_ev_cnts(ctr, prt)