MARKETING LESSONS FROM PT BARNUM   “Without promotion something terrible happens. Nothing!” declared Phineas Taylor Barnum, 19th century entertainer, businessman and circus king. And he was right. When he passed away in 1891 at the age of 80, he was so well known, he was given more column inches than any other celebrity who had lived before him. So how did the man known as “the Shakespeare of Advertising” make