Reviewed by GREG KINGDirector: Saul DibbStars: Sam Claflin, Asa Butterfield, Paul Bettany, Toby Jones, Tom Sturridge, Stephen Graham, Rupert Wickham.A timely release sees this powerful and moving drama about the horrors of war, the senseless slaughter of a generation of young men, and the futility of it all, reach our screens to commemorate the centenary of the end of WWI, “the war to end all …