It’s always been a cellar-dweller.But Lincoln Park Community Services, an anti-homelessness agency that matriculated in a group of church basements and now resides on the bottom floor of the Lincoln Park Presbyterian church on Fullerton Parkway, has still come a long way in 30-plus years.The organization now has around 2,000 volunteers each year, administers services at 17 sites and boasts a success rate of 60 to 80 percent of alumni staying housed and employed.With success comes expansion. The agency is planning to …