Icelandic writer-director Hafsteinn Gunnar Sigurðsson (“Under the Tree”) makes a smooth transition to English-language directing with the high-concept comedy “Northern Comfort,” co-written with longtime collaborators Halldór Laxness Halldórsson and Tobias Munthe. It centers on a disparate group of people who share a disabling fear of air travel, which they are trying to overcome through a […]