AREQUIPA, Peru — Carmen Manchego looks down at the remnants of homes sticking out of the quagmire of mud that engulfed the Peruvian mining town of Pampaylima."I have nothing left, nothing at all," she moans.Torrential rain late last week in Mariano Valcarel district of the southwestern Arequipa region provoked a mudslide on the San Martin Mountain.Several communes were buried