BOSTON - Without a whole lot of anagrammatical labor, "modern master," which is a term most people in the art game apply to Lucian Freud, becomes "monster dream," which might well describe - to some, anyway - both the artist and his art. Freud might actually like that. Lucian Freud's biography makes bad boy Paul Gauguin - whose life and work I just dove into in these pages - look like a choirboy. A choirboy in a dark religion, admittedly, but still . . .