Nothing Is True and Everything Is Possible: The Surreal Heart of the New Russia by Peter Pomerantsev Public Affairs, 2014, 254 pages, $34   Here’s the thing about reality television: it has very little to do with reality. But if the whole concept is an exercise in delusion, it has a real-world reflection in present-day Moscow, according to this entertaining, disturbing book. Pomerantsev is a British journalist of Russian heritage who relocated to the Russian capital in 2002, as—of course—a reality television producer, although he later worked on the news side. So much has changed so quickly that it is…