AL DABAYA, Egypt — Police in Upper Egypt have arrested a man who, according to eyewitnesses, gunned down a Christian on Jan. 13 for what family members believe was their refusal to drop charges against the suspect’s relatives in other killings in 2013. Hasan Baghdadi was arrested Jan. 14 in connection with the slaying of 38-year-old Shaheed Nesemis Saroufeem —…