The Survivalist is a lean film for lean times. It’s seven years after the end of civilisation, the collapse of oil production having devastated world population levels, a setup communicated quickly via an efficiently severe line graph animation. Out in the Irish countryside (shot in Ballymoney forestry) lives the unnamed recluse, played by Belfast’s Martin McCann (’71, Boogaloo and Graham), alone in a cabin and eking out a basic existence off the land. Derry-born Stephen Fingleton’s feature debut opens with an audacious establishing section, silent except for the scrape of bark and sploosh of wet soil, following McCann’s hermit as…