THE GREAT ENGLISH DIVIDE - More and more, speaking Europe's lingua franca is what separates the haves from the have-nots. As cross-border trade mushrooms, English is coming into its own as the Continent's only common ground. Last year, when France's Rhône Poulenc and Germany's Hoechst merged to form Aventis, they adopted English as the official corporate tongue. Now, masses of folk who don't want ...