After what seemed like years with few, if any, on-air personnel changes, the newsroom at Channel 6 (WOWT) has seen lots of turnover in the past several months.Most promising is the recent addition of Malorie Maddox, who comes to Omaha from Joplin, Missouri's KODE, where she was the main anchor for that station's 5, 6, and 10 p.m. newscasts. Rather than being stuck on the weekend evening shift,