In the past 20 years or so, Americans of all ethnicities throughout the country -- especially here in the Southwest -- have been making a big deal of Dia de los Muertos, the Mexican Day of the Dead celebration that spans several days and just happens to coincide with All Souls and All Saints Days (November 1 and 2) in the Catholic liturgical calendar. Leave it to those eminently creative Mexicans to concoct fabulous, regionally unique traditions that meld pre-Columbian rituals honoring t