KRAKOW, Poland, Jan. 26 - Heads of state, prominent Jews, Nazi death camp survivors and a handful of their liberators began gathering here Wednesday in a heavy snowstorm to commemorate the freeing of thousands of people from the nearby Auschwitz-Birkenau concentration camp 60 years ago.As many as 1.5 million people, including 1 million Jews, met their death at the Auschwitz complex, which included