A body was found in a burned-out home in Northern California, bringing the death toll to six from two of the state’s more destructive wildfires in recent memory, the authorities said Wednesday. The body was found Tuesday night in Lake County, about 100 miles north of San Francisco. Lake County sheriff’s officials said they believed the remains were those of Robert Taylor Fletcher, 66, who was last seen Sept. 16. The blaze that destroyed his home has charred 118 square miles.