TORONTO (CP) - Tell these feisty chicks to "shut up and sing" and they'll make a movie. The Dixie Chicks have rebounded from death threats, stinging political attacks and radio station battles with "Shut Up and Sing," a moving documentary that debuted this week at the Toronto International Film Festival. It was three years ago that front woman Natalie Maines told a London audience that the Texas band was embarrassed U.S. President George W. Bush was from their home state. Since then, the trio has weathered a firestorm of controversy to create a new album, discover new fans, have a...