A book that left burn marks on night tables across continents, 'Lovers And Gamblers 'has become a Collins classic. It features two of her most memorable characters: Al King, the rock-and-roll superstud who is everything any sex-crazed groupie ever imagined her hero to be; and Dallas, the beauty queen whose sky-high ambitions stem from a sordid secretthe type that tabloids tingle to tell. Togeth…