BADEN-BADEN, Germany — Who was the man hanging around the roulette table in the casino in this historic hot-springs resort? He had a black shirt, tie and jacket over black jeans and a two-day stubble, like some of his companions. He looked like a member of the Russian mafia. Or, he might have been a Russian pediatrician escaping his family for a few days, or one of Moscow's new tycoons, or a tycoon's bodyguard. Anyway, he was speaking Russian with his friends, and therefore exemplified a new trend in Baden-Baden, whose image seems inconsistent with anything new. After the better...