The couple, who were married on Saturday, were planning to settle in Düsseldorf, according to Juan José Maestre, a municipal official from La Llagosta, outside Barcelona.   Mr. Maestre said that Ms. Allaoui, 23, held Spanish and Moroccan citizenship, but it was unclear whether her new husband, Mr. Tehrioui, 24, who was from Morocco, also had a Spanish passport. A