For some reason, the arts and fine dining don't seem to mix. the theater district has long been a byword for bad food in New york, and the Lincoln Center area has only recently begun to show signs of culinary life, with gems like Picholine getting a little company, Sapphire, a new comer in the Lincoln Center neighborhood, may not be the last word in Indian Cusine, but it is good enough and good-looking enough to advance the cause.      The extensive menu includes the usual hit parade of samosas, curries, tandoori treats and even mulligatawny soup. but it also includes some sleepers like chutney....