(Adds details) By Martyn Herman RIO DE JANEIRO, Aug 12 (Reuters) - Bradley Wiggins fired Britain to track cycling team pursuit gold in a titanic final battle with Australia on Friday, etching his name as his country's most decorated Olympian to boot. Not only that but the Wiggins, Ed Clancy, Steven Burke and Owain Doull set broke the world record twice, also smashing their own London 2012 mark while demolishing New Zealand to reach the final. More...