Neil Patrick Harris opens his autobiography in the manner of David Copperfield, with his birth. Its title is “Neil Patrick Harris: Choose Your Own Autobiography,” and “you” were born June 15, 1973, at St. Joseph Hospital in Albuquerque, weighing 7 pounds, which is what an Emmy award weighs – “Concidence?” The Barnes & Nobles bookstore at Coronado Center was packed with hundreds of people Monday evening, all of them waiting for Neil Patrick Harris, author, to sign copies of his book.