What a happy idea Stéphane Lissner had for his first season in reprising the last (and necessarily melancholy) production by Hugues Gall a little more than 10 years ago, when he left the Paris Opera:there is an implicit homage, and the sign of a desire for continuity in excellence.For the excellence is there, in the prodigious staging by Robert Carsen, perhaps one of his most successful:in this setting, which is an elegant mise en abyme of the Opéra Garnier, the...