By Luc Cohen and Brendan Pierson NEW YORK (Reuters) -A man charged with last month’s mass shooting in a New York subway, one of the most violent attacks in the history of the city’s transit system, pleaded not guilty to terrorism and weapons charges in Brooklyn federal court on Friday. Frank James, 62, is accused of carrying out an April 12 gunfire and smoke bomb attack that injured 23 people. He entered his plea before U.S. District Judge William Kuntz, dressed in khaki prison clothes. James’ lawyer, Mia Eisner-Grynberg from the Federal Defenders of New York, did not seek to have her client r…