WASHINGTON (AP) - Sol M. Linowitz, a diplomat, lawyer and businessman who played key roles in Middle East peace negotiations and the Panama Canal treaty during the Carter administration, died Friday. He was 91. The one-time chairman of Xerox Corp. died at his home in Washington, said the Academy for Educational Development, the nonprofit group where he had served as honorary board chairman since 1990. Linowitz was ambassador to the Organization of American States during the Johnson administration and in 1977 helped negotiate the historic transfer of the Panama Canal to Panama. He also represented President Carter in Middle East...