Billy Connolly is loud, hilarious and contradictory. His biography, written by his wife, former comedian and practising psychotherapist Pamela Stephenson, is pretty much the same. Over the years Connolly has grown from Glasgow shipyard welder to folk-singing beardy hard man (yes there is such a thing) to darling of the good and great (or at least famous) around the world. That he is so many things to so many people while in no way compromising…