Department of Informatics, University of Bergen, Bergen, Norway. harald.barsnes@ii.uib.no|Department of Informatics, University of Bergen, Bergen, Norway. harald.barsnes@ii.uib.no|Department of Informatics, University of Bergen, Bergen, Norway. harald.barsnes@ii.uib.no|Department of Informatics, University of Bergen, Bergen, Norway. harald.barsnes@ii.uib.no