By Francesco Canepa and Terje Solsvik OSLO (Reuters) -Sitting in his lakeside villa in the Swiss city of Lucerne, Borger Borgenhaug misses his grandchildren and the smell of the Nordic sea on a clear summer night. The carpenter turned real-estate tycoon says that is the price he pays to escape Norway's beefed-up wealth tax – an annual levy that has driven hundreds of millionaires abroad while underpinning one of the world's most equal societies. "The political climate in Norway has become increasingly h ...