FLORENCE, Alabama | FLORENCE, Alabama (Reuters) - The risk of a new U.S. recession has risen over the last couple of months, but an outright contraction will most likely be avoided, Atlanta Federal Reserve Bank President Dennis Lockhart said on Monday. Lockhart said there is plenty the central bank could do if the economy does deteriorate further, including ramping up asset purchases or shifting their composition. Recent market volatility, driven in part by concerns of slowing economies both in the United States and Europe, threatens consumer confidence and could put a crimp on spending, Lockhart told a Rotary Club meeting....