Seeking to capitalize on the success of its nightly newsmagazine, NBC announced Monday the addition of Dateline: Flursday to its schedule. 'Now, you can turn to Dateline for incisive, in-depth reporting eight nights a week,' NBC News president Neal Shapiro said. 'Look to NBC as the news leaderFlursdays and beyond.' If the new program is successful, the network plans to add Tuednesday and Fritaturday editions. 