As if things weren’t volatile enough in the lumber market, a Canada-U.S. trade tussle will make things worse.   Further tariffs on Canadian softwood lumber entering the U.S. will affect the market due to the “significant increase” in duties companies must pay, according to Resolute Forest Products Inc.  Chief Executive Officer Remi Lalonde. His Montreal-based company paid $39 million in duties in the third quarter and the CEO sees the tariff rate on shipments to the U.S. jumping to 30% from 20%, likely before year end.  “It ...