Heavens, something is afoot in the local village. There’s a doctor, a young American interloper, the pervading dangers of alcoholism: Yes, it’s Amazon’s newly acquired British period drama Julian Fellowes Presents Doctor Thorne, with the Julian Fellowes of Downton Abbey, the Alison Brie of Community, the Ian McShane of Deadwood, and the obsession with social class of every British novel.