SHANGHAI, Oct 25 (Reuters) - Former world number one Luke Donald and his Ryder Cup team mate Graeme McDowell have rowed into the debate over who should lead Europe in 2014 by backing Ireland's Paul McGinley. The European Tour is set to announce a replacement for the victorious Jose Maria Olazabal early next year with Darren Clarke firm favourite to lead the defence of the trophy at Gleneagles in ...