INDICTED. Marion S. Barry Jr., 54, mayor of Washington; on six counts of misdemeanor drug offenses (cocaine possession, conspiracy to possess cocaine), less than four weeks before he is to go on trial on eight counts (including three felony charges of lying) handed up after his arrest in January in an FBI sting operation; by a federal grand jury in Washington. Despite his legal problems and treatment for alcoholism and prescription-drug addiction, he has been acting as though he will run for a fourth term; a felony conviction would make him ineligible to hold the office.