WHERE HAVE ALL THEY GONE? The nearly 24-kilometer Epifanio de los Santos Avenue, the major road artery in the metropolis of nearly 16 million, where heavy vehicular traffic is a daily sight, appears Tuesday, eve of All Saints Day, left in the lurch, with only a few wheels plying the pigeon-holed eight-lane highway, although the numbers coding scheme has been lifted until November 1. Lino Santos