By Marie-Louise Gumuchian LONDON (Reuters) – Dark Western “The Power of the Dog” scooped the top two honours at the British Academy Film Awards on Sunday, winning best film and director for Jane Campion, while sci-fi epic “Dune” picked up the most prizes. New Zealand filmmaker Campion wrapped up a successful weekend for her comeback feature film, after winning the top honours at the Directors Guild of America awards in Beverly Hills the day before. Based on the 1967 novel by Thomas Savage, the critically-acclaimed movie set on a 1920s Montana ranch marks the return of Oscar winner Campion to f…