Plot: More than two decades before Shania Twain riled up Nashville with her belly-baring outfits, a cleavage-happy bottle blonde named Dolly Parton was rewriting the rules for country singers, using her Tennessee mountain roots to inspire ballads of love and endurance while wowing the cowpokes with her skin-tight outfits and sky-high stilettos. But the climb to country queendom wasn't easy: Parton faced far more than boob jokes as she rose from variety-show eye candy to music legend