At a snowy Berlinale, against a backdrop of political divisions, this year’s standouts include Lucile Hadžihalilović’s The Ice Tower, Richard Linklater’s Broadway biopic of Lorenz Hart, and intensely sexual romance starring Jessica Chastain
French director Guillaume Ribot’s new film shines a light on the making of Lanzmann’s nine-hour Holocaust opus – a tale of obsession, deception and danger