When we first encounter Samet, the solitary protagonist of Turkish director Nuri Bilge Ceylan’s superb drama “About Dry Grasses,” he’s miserable. But even by Ceylan’s stringent standards, “About Dry Grasses” is a dour and enveloping affair, featuring one of his most complicated and, ultimately, despicable protagonists. But secrets have consequences, and in “About Dry Grasses,” the repercussions of Samet and …