It's 6 a.m. in Rittenhouse Square, one of Philadelphia's most elegant parks. As the sun rises, its overnight summer residents - more than two dozen homeless men and women - are asleep on benches. --snip-- And while homeless people say they like the comforts of the high-end neighborhood, the Rittenhouse Square residents, managers of nearby businesses, and Fairmount Park Commission employees who maintain the grounds complain that the resulting problems have gotten worse this summer, making their jobs and neighborhood life more difficult