WASHINGTON (Reuters) - Nearly a year after the Columbia disaster, NASA (news - web sites) is only beginning the sweeping changes recommended as conditions for the space shuttles' return to flight, an independent task group reported on Tuesday. "Detailed plans for many of the recommendations have not been forthcoming," the group said in an interim report. "NASA has not been timely in some of their responses to task group requests for information." The independent panel, called the Return to Flight Task Group, was charged with monitoring NASA's progress in complying with recommendations of the Columbia Accident Investigation Board, which probed...