BERLIN (Reuters) - German Chancellor Angela Merkel, in an interview published days before her first visit to the United States, said Washington should close its Guantanamo Bay prison camp and find other ways of dealing with terror suspects. "An institution like Guantanamo can and should not exist in the longer term," Merkel said in an interview with the weekly magazine Der Spiegel published on Saturday. "Different ways and means must be found for dealing with these prisoners." Merkel has vowed to repair ties with the United States, severely strained over the U.S.-led Iraq invasion, which her predecessor Gerhard Schroeder strongly...