Lowering of flags for Pope Francis reignites secularism debate in France / Isabelle Bernard, wife of murdered French teacher: 'Secularism is a framework for living well together' / Quebec creates new committee to study whether secularism rules are being followed / Violence in French school sparks debate on headscarf and secularism / From schools to the Olympics, how France's staunch secularism affects religion in public life / France is proud of its secularism. But struggles grow in this approach to faith, school, integration