UNITED NATIONS, Nov 3 (IPS) - U.N. Secretary-General Kofi Annan was quick to congratulate U.S. President George W Bush on his re-election Wednesday but diplomats and U.N. watchers issued warnings about future U.S.-U.N. relations. Annan, who irritated the White House recently by describing the U.S. invasion of Iraq as ''illegal,'' has little or no choice but to welcome four more years of a new Bush administration, according to U.N. diplomats and officials. ''If the United Nations is to survive as an institution, it has to learn to live with the United States,'' said an Asian diplomat, speaking on condition of...