For those balletomanes who have found the fare a bit austere and abstract in this fast concluding San Francisco Ballet season, "Onegin" is back as the final program of the year. Based on Alexander Pushkin's immortal verse novel, "Eugene Onegin", John Cranko's version has everything: seething melodrama, opulent ensembles, love and death, five major roles and sheer grandeur. Since its 1965 Stuttgart premiere, this has become the most widely seen contemporary narrative (I have experienced it in three different countries). Borrowed from the National Ballet of Canada, the production by Santo Loquasto is abundant in birch trees (scenes of rural Russia) and chandeliers (aristocratic St.