Given the films he’s made lately, it would be hard to blame anyone for giving up on director Robert Altman. But his latest, “Gosford Park,” is assured and deftly-made enough to reaffirm his reputation as one of the greats, and certainly as the master of nuanced ensemble pieces. In fact, “Gosford Park” is a complete delight, as comic and touching as any film from the past few years, and filled with terrific, minutiae-filled performances from some formidable performers.