PARIS (Reuters) - France and Germany will propose a dual presidency for the European Union today, telling the convention on the continent's future both the European Commission and EU member states should have stronger leaders. French President Jacques Chirac and German Chancellor Gerhard Schroeder have agreed to split the difference between their competing visions of the EU's future by proposing more powerful heads for the Commission and the European Council. The proposal, to be sent on Wednesday to a group drawing up an EU constitution, blends France's wish to defend member states' powers through an enhanced Council and Germany's goal...