Column - During the USA-Africa summit in December last year, President Paul Biya of Cameroon was videotaped in a highly compromising situation. Old and senile at almost 90, he entered the conference hall unaware of where he was and what he was supposed to do. "Oh wow, so I have become a celebrity?", he asks his aide, "Who are all these people present?" When the aide tells him that he is supposed to give a speech, he says, "Are there important personages among them." It is a very embarrassing moment for the old man