<p>ON A SUNNY Saturday afternoon amid the slouching pines and old headstones in Evergreen Cemetery in East Oakland, uniformed soldiers -- Confederate and Union both -- stood straight-backed at attention, saluting an approaching dignitary. It was not some president or general, boldly rolling up in a military jeep. Nay, it was the woman of the hour -- Oakland's 106-year-old Alma Grigsby, meekly bumping along on a cemetery lawn mower.</p>