Eton College has apologised to the first black student to complete his studies there, Dillibe Onyeama, after he was subjected to years of racial abuse from his fellow students and then banned from visiting the school when he wrote a book detailing his abuse.   Nigerian-born Dillibe Onyeama was ridiculed by students because of his race during his stay in the school. Boys from the school accused him of being riddled with maggots and asked him: “Does your mother wear a bone in her nose?” …