Biggby Coffee held the grand opening of its new Gladwin store at 1247 E. Cedar Tuesday and, even in the middle of the afternoon long after many customers needed a jolt of caffeine, the line was 10 cars deep. Biggby donated $1 from every cup sold to the Gladwin County Animal Shelter and also partnered with Mid-Michigan Machine Tool, which matched the donation amount with a gift to Gladwin New Dawn …