By Joe EskenaziFirst there were the Zebra Murders. Then Zodiac. And now -- the serial porta-john arsonist. As the 13th smoldering outhouse since November was doused early this morning, the realization was unavoidable: The city is, once again, host to a disturbed individual terrorizing our denizens with bursts of random crime ... except now he (or she) is not killing people but immolating outhouses on Russian Hill. Certainly our city government will tell us that this is progress. Is this toilet-t
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