Reviewed by GREG KING Documentary Director: Ondi Timoner Like last year's superb music docos Metallica: Some Kind Of Monster and The End Of The Century: The Story Of The Ramones, Dig! is a fascinating portrait of the creative pressures and internal tensions that can shape a band's future. Filmed over seven years and culled from some 1500 hours of footage, Dig! is a wonderful warts and all exploration of …