As the population of black bears increases, Addison County residents are reporting sights of the big mammals nearer human habitation. Christy Alger took this photo of a black bear at her house off Route 73 in Orwell on June 10. Photo by C. Alger ADDISON COUNTY — Black bear populations have been on the rise — a trend that hasn’t gone unnoticed by Vermonters. Some have experienced it up close and personal. Gretchen Conkey was working in her West A…