TURNING A THEATRICAL LEMON INTO FIZZY LEMONADE Matthew Lombardo spins a true-life theatrical disaster into a relentlessly funny backstage comedy According to Nora Ephron, who turned her husband's infidelity into a best-seller and screenplay for the novel and the movie Heartburn, "Everything is material." But she didn't say it should be hilarious material. If she… The post Theater Review: WHEN PLAYWRIGHTS KILL (Hunt…