A thin film of oil spread from the Costa Concordia cruise ship as waves battered its wreckage off Italy’s coast Wednesday, adding to fears of an environmental disaster in the area’s sensitive, pristine waters. Authorities were trying to assess how serious and extensive the spread was. Italian authorities also identified a German woman, Siglinde Stumpf, as being among those killed in the Jan. 13 capsizing of the vessel. Stumpf is the 17th person whose body has been identified. Fifteen others are listed as missing.