Suffolk District Attorney Daniel Conley is not seeking re-election this fall, 16 years after he first won the high-profile seat prosecuting crimes in Boston.Conley is meeting with members of his leadership team this afternoon to discuss the decision, according to a source close to the district attorney.Conley, who's held the post since 2002, is a former assistant district attorney and city councilor, and decided to move on after the source called an "outstanding run" atop the office, which handles prosecutions in Boston, Chelsea, Winthrop and Revere.