A weekend retreat at a cozy mountain lodge is supposed to be the perfect getaway. But when the storm hits, no one is getting away. It's winter in the Catskills and Mitchell's Inn, nestled deep in the woods, is the perfect setting for a relaxing, maybe even romantic, weekend away. It boasts spacious old rooms with huge woodburning fireplaces, a well-stocked wine cellar, and opportunities for cross-country skiing,