The president of Seattle's public-television station abruptly announced his retirement yesterday, noting "others may not believe I'm the one to lead the station" through its profound financial problems. Burnill "Burnie" Clark, 61, who has led KCTS since 1987, said the station would also scale back production of national shows and would lay off up to 25 percent of its staff, about 35 jobs. KCTS has piled up millions in operating deficits and cannot pay its bills. It owes $229,000 in rent to Seattle Center, $2.8 million in back dues to the Public Broadcasting System and its cash deficit tops $1.2...