The world’s largest floating stage of the Bregenzer Festpiele will again  host in 2008  the masterpiece of Italian composer Giacomo Puccini, “Tosca”.  Central to the dramatic opera are betrayal and jealousy between three intense characters committed to their own cause – be it love, art or politics – to the point of ruthlessness:  The celebrated singer Floria Tosca, the successful painter Mario Cavaradossi, and the chief of police Scarpia. The tragedy is set in motion…