Switzerland’s Locarno International Film Festival gets under way on Saturday, with the competition fierce for the top prize the Golden Leopard. The documentary “Bogancloch” by British director Ben Rivers, co-produced by German producers, is widely regarded as the favourite for the main prize. The film is a cinematic essay about the life of a hermit. German actresses Maren Eggert (“The Sparrow in the Chimney”) and Helena Zengel (“Transamazonia”) are widely seen as having chances for a best acting award. The German director Christoph Hochhäusler could be awarded for his direction of the gangster…