By Howard Schneider and Ann Saphir WASHINGTON (Reuters) -A half-point interest rate increase “will be on the table” when the Federal Reserve meets on May 3-4 to approve the next in what are expected to be a series of rate increases this year, Fed Chair Jerome Powell said Thursday in comments that pointed to an aggressive set of Fed actions ahead. With inflation running roughly three times the Fed’s 2% target, “it is appropriate to be moving a little more quickly,” Powell said in a discussion of the global economy at the meetings of the International Monetary Fund. “Fifty basis points will be o…