The mayor of Paris, having declared the Seine “officially cleansed”, did the front crawl down a portion of it yesterday. Meanwhile, the police conducted a “social cleansing” of the homeless camps along Canal St Martin, Canal de l’Ourcq and Canal Saint-Denis in preparation for the arrival next week of the Olympic flame. The prefecture spokesperson made a statement about "sheltering the most marginalized" by providing lodgings for 200 people. The collective “Le vers de la monnaie” says long-term housing for 20,000 are required…