Kingmaker or gold digger? Paul O’Connor takes a look at a recent biography of the most famous seductress in the 20th century. Reviewed by Paul T. O’Connor KINGMAKER: Pamela Harriman’s Astonishing Life of Power, Seduction and Intrigue. By Sonia Purnell. Penguin Random House Audio. Read by Louise Brealey. 16 hours, 58 minutes. Also available in…