Debussy’s “Pelléas et Mélisande” is one of opera’s greatest works and on Friday night, the Teatro Colón, in a production by Susanna Gómez (continuing the work of its original director, the late Gustavo Tambascio), reminded everyone why. The French work is often mentioned in the same breath as Wagner’s “Tristan und Isolde,” undeniably because the composer was, at that time, {…}