We used to sit at the soda fountain at Dolly Madison Creamery and drink "fresh lime cokes" or malts or hot fudge sundaes back in 1962 before it became "Bonnie Brae Ice Cream."    I just went there last night, so I guess I've been going there for over half a century.   Bonnie Brae Ice Cream and "Carl's" (Bonnie Brae Tavern) are landmark institutions now.