Hope Dickson Leach keeps her aim steady and hits her targets in The Levelling, her first feature and a sturdy, professional piece of grim English countryside realism. Trainee veterinarian Clover (Game of Thrones’ Elle Kendrick) is called back to the family farm when she receives word that her brother Harry, who was just given stewardship over the land, has shot himself with a hunting shotgun. The police have filed it as suicide, but her father Aubrey (Joe Blakemore), insists that it was just a “bloody stupid” accident, a descriptor he seems to apply to almost everything, his manner one of…