Reviewed by Linda C. Brinson THE WHOLE TOWN’S TALKING. By Fannie Flagg. Read by Kimberly Farr. 16 CDs; 12 hours. $54. Also available in print from Random House. Just as there is comfort food, there are comfort books. Once again, Fannie Flagg has dished up the latter in fine style. Some people know Fannie Flagg…