Andrew Wallenstein President and Chief Media AnalystA man who made a career out of telling powerful people in Hollywood what they don’t want to hear is now telling everyone what that was like.Kevin Goetz, founder and CEO of audience research firm Screen Engine/ASI, has written a book, “Audience-ology: How Moviegoers Shape the Films We Love,” with Darlene Hayman that looks back on three decades of using test screenings to help studios and other clients fix their films before release.That often