Gus Souris remembers the first time he ate at the Royal Restaurant, as a young Army soldier stationed at Fort Myer. One day, he took a bus to Alexandria and came upon the restaurant while exploring Old Town."I just walked in and I liked the people and I liked the food," Souris recalls. "They served the best beef stew I ever had."That was close to 70 years ago and Souris, 96, is still a frequent diner at the Royal. Indeed, until recently, when he moved from Alexandria to live with his son in La Plata, he ate there almost every day. "I just love the place,"