SWAMPSCOTT — A middle-school student had the ends of two of his fingers blown off yesterday by a homemade bomb that went off inside his Melvin Avenue home, authorities said. The victim's brother said rescue workers could find only one of the fingertips. The 13-year-old victim, identified by family and neighbors as Joel Surette, was taken to Massachusetts General Hospital in Boston by ambulance. "First, he was screaming for five minutes," said his brother, Michael, 17, "He said, 'I can't believe I blew off my fingers.'" Joanne Schumann, who lives two houses from the Surettes, was eating dinner with her...