By Stephanie Nebehay GENEVA (Reuters) - Israel appeared before the main United Nations human rights body on Tuesday, ending a 20-month boycott of the Geneva forum which it accuses of bias against the Jewish state. Eviatar Manor, Israel's ambassador in Geneva, led its delegation to the session, held as part of the U.N. Human Rights Council's examination of U.N. member states every four years. "It was not an easy decision to make," Manor said in an opening statement to the talks. "But Israel's unfair treatment must come to an end. ...