NEW YORK (Reuters) - The New York Stock Exchange banned an al Jazeera reporter from its trading floor on Monday, saying it was restricting access to "responsible" networks, as the Arab satellite television channel faces criticism in the United States for its coverage of the war in Iraq. "We've had to focus our efforts on networks that focus on responsible business coverage," said NYSE spokesman Ray Pellecchia, declining to comment further. He described the Al-Jazeera ban as "indefinite." Several other news organizations have also been denied entry to the exchange's downtown Manhattan trading floor in the past few weeks, Pellecchia...