By Jonathan Wilson A stampede outside a Cameroon knockout-stage match killed eight, leaving a permanent blight on the competition and plenty searching for answers. View the original article to see embedded media. YAOUNDÉ, Cameroon — In late November, the Confederation of African Football (CAF) threatened to take the Africa Cup of Nations away from the Stade Olembe, the new showpiece stadium in Yaoundé, unless “external works” were concluded within 10 days. Those works included an access road and a security fence. It appears that, inadvertently, those features caused the deaths of eight fans du…