(Commentary by Marva Barnett, professor and director of the Teaching Resource Center at the University of Virginia, where she teaches in the French Department) “Les Misérables,” that most popular of musicals, comes at last to movie theaters — and on Christmas Day. What could be better than to have this story of love, grace and redemption arrive during the season of good will and generosity? Yet, as other “Les Mis” fans anticipate this long-awaited film, my