TO GO WITH AFP STORY BY THOMAS CABRAL Angolan businesswoman Isabel dos Santos (L) and her husband Sindika Dokolo, a Congolese arts collector and businessman, attend an art exhibition in Porto, northern Portugal on May 3, 2014. Elder daughter of Angola's long reining President Jose Eduardo dos Santos, Isabel is, according to Forbe's magazine, the wealthiest woman in Africa. AFP PHOTO/ PUBLICO/ FERNANDO VELUDO/ PORTUGAL OUT
