The Catalunya Spirit left its location off the coast of Gloucester, Mass., under its own power Friday night, after the Captain of the Port of Boston lifted the detention order placed when the LNG tanker lost propulsion 35 miles east of Chatham, Mass., early last week. The 933-foot tanker has been under positive control at the site of the future Neptune Offshore LNG facility off Eastern Point Light since Tuesday while technicians worked nearly around the clock to complete repairs. At 8:40 p.m., Friday, the Captain of the Port of Boston, Coast Guard Capt. Gail Kulisch, reviewed and approved the final repair certification presented by Lloyd's Register…