PITTSBURGH — The Colorado Avalanche hockey club is still not whole, but it sure looks like a potential powerhouse again. Mikko Rantanen had a hat trick and two assists, and Nathan MacKinnon had one goal and four assists as Colorado’s stars dominated in a 6-2 victory Tuesday night against the Pittsburgh Penguins at PPG Paints Arena. The Avs finished a season-long five-game road trip with four victories and are now a season-high four games over .500 (17-13-0).