Not many people would sell their homes to go sailing up and down the east coast of the United States and into the Caribbean for six years. But Heather and Dave Mann, late of Wisconsin and now of Summerville, did just that. Dave says they did it for the adventure, and they had plenty of those, which Heather recorded in a book about the lessons she learned from the ocean during their voyage aboard their sailboat, the Wild Hair. Along the way, they and their sole companion, Dinghy the sailing cat,