BRUSSELS The European Commission is to present EU countries with the final text of a huge trade deal with South American bloc Mercosur for approval today, according to EU sources. Twenty-five years in the making, the agreement with the club bringing together Argentina, Brazil, Paraguay and Uruguay will create a 700-million-customer free-trade area. Struck by Brussels in December, it still needs to be approved by at least 15 of the EU's 27 member nations, and the European Parliament, to be