It's November and turnover is in the air. First, Doug Walker decides to leave WOWT to go help OPS Superintendent John Mackiel play TV. Now comes word that KETV reporter Trisha Meuret plans to leave KETV in a week or so to work for Pete Ricketts' Senate campaign.Such departures always create a situation that we love here at OMA News: the opportunity for a station to introduce a fresh face into the