Inside a secret bomb-proof building in a Tel Aviv suburb, which Google Earth does not include on its website, some of the occupants last week exchanged high-fives at their work stations. According to insiders, several sent each other the same message: The Chief’s Last Hit. That “chief” was Meir Dagan, the outgoing head of Mossad. On his first day in office eight years ago, Mr Dagan had stood on a