By Erik Kirschbaum BERLIN (Reuters) - Greece should leave the euro zone to save its own economy and to spare the rest of the Europe Union a lot of time, trouble and money, the editor of Germany's influential newspaper Bild said in an interview with Reuters on Friday. Kai Diekmann's daily is read by some 12 million and has, more than any other newspaper, shaped public opinion in Germany, the biggest European contributor to the bailout programmes that have kept Greece afloat for the past five years. ...