* Notes * Philharmonia Baroque Orchestra and Maestro Nicholas McGegan (pictured, photograph by Suzanne Karp) opened a run of Händel's Aci, Galatea e Polifemo last night at the ODC Theater in San Francisco. The fully-staged co-production with the Brooklyn-based National Sawdust is absolutely menacing but beautifully acted, sung, and played. The short piece is not a…