Are there many flawed geniuses left for Benedict Cumberbatch to play? The actor has already stepped into the shoes of Stephen Hawking, Vincent Van Gogh and Sherlock Holmes. Right now he’s making a film about troubled wartime codebreaker Alan Turing. And here he is in ‘The Fifth Estate’, sporting lank white hair, puffy eyes and a paranoid glare. He is Julian Assange, WikiLeaks founder and, depending where you stand, radical crusader or crazed egomaniac – or both.