Former Zambian President Kenneth Kaunda is due to be buried next Wednesday. At the podium, this Friday 2 July, the current president Edgar Lungu was whistled during his speech. Zambia is organizing a one-and-a-half-month presidential election in a tense climate "on the brink of a human rights crisis", according to Amnesty International, which criticizes the repressive methods of the six-year-old head of…