GLOBAL MARKETS-Dollar rallies on data, Europe woes; stocks, commods fall

* Dollar rallies across the board * Metals down, crude further pressured by U.S. shale (Updates prices, changes dateline from previous LONDON) By Rodrigo Campos NEW YORK, May 26 (Reuters) - The U.S. dollar rallied on Tuesday after a string of healthy economic data boosted near-term rate hike prospects, while Greece's financial crisis and signs of growing opposition to austerity in Spain weighed further on the euro. Stocks and commodities took a knock as the greenback pushed hig