Wall Street set for flat open; Yellen, data on tap

By Chuck Mikolajczak NEW YORK (Reuters) - U.S. stocks index futures pointed towards a flat open on Wednesday, after the Dow and S&P 500 climbed to their latest records, before a second day of testimony from Federal Reserve Chair Janet Yellen and data on the housing market. The Fed chair told a congressional committee that the Fed is preparing to consider increases "on a meeting-by-meeting basis," a subtle change that helps to lay a foundation for the central bank's first rate