A A LOS ALAMOS, N.M. (AP) ??? Firefighters battled a 145 square-mile fire burning in a canyon leading to parts of the Los Alamos nuclear lab and an evacuated town, even as confidence rose that both would be spared from the flames.Some of the 1,000 firefighters at the scene lit backfires Thursday to remove brush and other fuels as well as coat a canyon slope with a thick line of fire retardant foam