Tuesday March 01, 2011 05:35:20 AM GMT MARKETS-PRECIOUS (UPDATE 7) * Unrest in Yemen, Oman, Libya fuels safe-haven buying * Middle East, N. Africa tensions support oil, hit dollar * Silver prices set for 20 pct rise in February * Coming up: Fed’s Bernanke Congress testimony Tue, Wed. (Recasts, updates prices, market activity; changes byline,…