On a desolate fringe of a Queens park, a gang of homeless men set upon a woman and dragged her into their squalid encampment, raping her for two hours while cops mounted a frantic search. The 42-year-old victim finally was rescued when a police dog picked up her scent, tracked her to the hobo jungle and sank his teeth into one of the men who brutalized her, authorities said. "It is a horrendous crime," Police Commissioner Raymond Kelly said as the five assailants were booked on kidnapping, robbery, rape and sodomy charges. The attack occurred at 10 p.m. Thursday at...