Nikkei rises for a 6th day, longest winning streak since Dec

TOKYO, May 22 (Reuters) - Japan's Nikkei share average edged up on Friday in thin trade, extending its gains into a sixth day as optimism for the recovering economy supported the mood after the Bank of Japan's two-day policy meeting. The central bank maintained its massive stimulus programme and offered a slightly more upbeat view of the Japanese economy, as a modest rebound in consumption helped service-sector sentiment improve to a one-year high. The Nikkei 225 ended 0.3 percent highe