ST. AMANT, La. — Flood-weary residents cleaned out houses Saturday as search parties went door to door looking for survivors or bodies trapped by flooding so powerful in some cases it disturbed the dead and sent caskets floating from cemeteries. At least 13 people died in the flooding that swept through parts of southern Louisiana after torrential rains lashed the region. An estimated 60,000 homes have been damaged, and 102,000 people have registered for federal assistance so far.