MARSEILLE Tens of thousands of people are expected to watch Pope Francis process through the streets and celebrate mass in the French Mediterranean city of Marseille Saturday, where the pontiff has waded into an inflamed European debate about accepting migrants. The Velodrome stadium in France’s second city will be packed with almost 60,000 people, while as many as 100,000 could line the Avenue du Prado for his “popemobile” tour ahead of the mass. Francky Domingo, a Beninese man who heads a