After spending the late morning in Greenport on Sunday — riding the carousel and getting our son Jackson out onto the ice for the first time — my family and I stopped at Bonnie Jean’s in Southold for lunch. Bonnie Jean’s might seem like little more than another Long Island diner, but it is a new favorite for its affordability, its family-friendliness and for the homemade flourishes across the menu. The restaurant now has a beer and wine license after operating for a time as a BYOB. It would have been easy for owner Jennilee Morris to offer cheap, not-very-good wines chosen by a…