“Does everyone have to be a hero?” The question comes from thirtysomething art teacher Samet (Deni̇z Celi̇loğlu), burst out in frustration in the heat of an intense argument with his fellow educator and would-be girlfriend Nuray (Merve Di̇zdar), as they disagree over just how, or how much, any individual is obliged to contribute to society. It’s a familiar cry from a male protagonist in a film by Turkish director Nuri Bilge Ceylan, even if it hasn’t ever been worded quite so directly: “About Dry Grasses,” his long, languid but slowly captivating ninth feature, is merely his latest work to examine man’s right, for better or worse, to be