In an edition devoted to Africa, Edward Stourton reports from war-ravaged Angola, where victims are preferring to seek out shamans instead of doctors. Rageh Omaar travels to the Democratic Republic of Congo game park to look into why the gorillas there have become targets for poachers, and Gary O'Donoghue visits a Ghanaian village where river blindness afflicts one person in five. See Choice. Producer Lucy Hetherington ; Editor Fiona Murch (S)