It's gettin' hot in hereThe Mayor's Office of Criminal Justice has sent a memo to Board of Supervisors President David Chiu asking him to back off efforts to set up a stricter nightclub permitting process, the latest volley in an intensifying intra-city feud over how to handle rising club violence.The memo, dated June 19, was recently obtained by SF Weekly. It concerns legislation that would affect how the San Francisco Entertainment Commission -- a seven-member board of political appointees who