In New Zealand: the death certificate of a woman read 'bronchial asthma.' But neighbors saw invisible hands choke the breath from her body--killed by makutu, the dreaded Maori sorcery. In Ceylon: hideously masked devil dancers screamed and writhed around the body of a catatonic young girl--as they restored her long-lost sanity. In Polynesia: a white man joined native fire-walkers to tread baref…