THE MAGINOT LINEHow big a catastrophe would an attack on Iran be?http://news.yahoo.com/s/ap/20071016/ap_on_re_mi_ea/iran_russia;_ylt=AkNmxpMg.TkQhwKGr.P3X0us0NUEVladimir Putin issued a veiled warning Tuesday against any attack on Iran as he began the first visit by a Kremlin leader to Tehran in six decades — a mission reflecting Russian-Iranian efforts to curb U.S. influence. . .http://