Cyprus Greeks and Turks Agree On Plan to End 40-Year Conflict
Greek and Turkish Cypriot leaders accept Sec Gen Kofi Annan's plan for ending decades-long division of Cyprus and pledge to negotiate reunification in time for island's May 1 entry into European Union; deal between Greek Cypriot Pres Tassos Papadopoulos and Turkish Cypriot leader Rauf Denktash is reached after three days of talks at United Nations; only Greek Cypriot government would be entitled to join union if reunification was not achieved; Turkey accepts plan, aware that failure in Cyprus would jeopardize its own candidacy to become first Muslim nation to join union; chronology of political events in Cyprus; map (M)