Photograph of Mayor Bloomberg during a visit to Walworth Academy school in London by Kirsty Wigglesworth/AP Though a huge development project near and dear to his heart suffered a major blow, Mayor Bloomberg is rallying the city's fortunes by visiting Europe. Yesterday, the mayor was in Belfast, visiting the Titantic Quarter and mixing up City Council Speaker Christine Quinn's family history (he said her mother--when it was actually her grandmother--who survived the Titanic, which......