CAMP DAVID, Md. — Leaders of the world’s wealthiest nations opened the door Saturday to more government spending in Europe as way to revive the continent’s struggling economy, shifting away from the idea that the surest way to recovery was through strict fiscal austerity. Meeting at the Group of Eight summit at Camp David, President Obama and his fellow leaders said they were committed foremost to creating jobs and growth, a shift, at least in emphasis, from previous gatherings dominated by German efforts to reduce high government debt through drastic fiscal reform. In a joint statement, the leaders of eight...