Yesterday was the 25th annual school performance of the Pacific Northwest Ballet School. Actually, it was 25a and 25b, as the younger children, levels I-IV from Seattle and Bellevue, and Dance Chance levels I-II performed at noon, followed by excerpts from Bruce Wells' Hansel and Gretel, five of Balanchine's Raymonda Variations, and the "Scherzo" from Balanchine's A Midsummer Night's Dream. At 3:30pm, it was the turn of levels VI-VII girls and levels V and VII boys in choreography by their te