NEW YORK — A former senior investigator on the Independent Inquiry Committee (search) who thinks the panel has gone too soft on U.N. Secretary General Kofi Annan (search) in its Oil-for-Food investigation has been called to testify before Congress next week. Rep. Chris Shays (search), chairman of the House Government Reform's Subcommittee on National Security, Emerging Threats and International Relations, issued a subpoena to Robert Parton (search) on Thursday. Parton on Wednesday night handed over documents relating to the investigation after he was issued a subpoena by another panel, the House International Relations Committee, on April 29. "He [Parton] did...