In Lindy West’s new book, “Shit, Actually: The Definitive, 100% Objective Guide to Modern Cinema” (Hachette, $27), many important cinematic questions are asked. Such as, why is Laura Linney wearing a woolly hat to a church wedding in “Love, Actually”? Does the Hogwarts Express in the “Harry Potter” movies run year-round, or is it just twice a year to take the Hogwarts kids to and from school, and if so how does the witch who runs the snack trolley pay her bills? What exactly does being king of whatever the lion is the king of (in, duh, “The Lion King”) entail, and why should zebras and antelop…