For Londel Davis, owner of Londela(EUR)(TM)s Supper Club, the success of the restaurant is the fulfillment of his lifelong dream of making a tangible contribution to the community where he spent his boyhood and youth. Frederick Douglass Boulevard between 139th and 140th streets, home of Londela(EUR)(TM)s restaurant, was not a tranquil middle-class haven when Mr. Davis was growing up in...