Faculty of Computer and Information Science, University of Ljubljana, SI-1000 Ljubljana, Slovenia. gregor.rot@fri.uni-lj.si|Faculty of Computer and Information Science, University of Ljubljana, SI-1000 Ljubljana, Slovenia. gregor.rot@fri.uni-lj.si|Faculty of Computer and Information Science, University of Ljubljana, SI-1000 Ljubljana, Slovenia. gregor.rot@fri.uni-lj.si|Faculty of Computer and Information Science, University of Ljubljana, SI-1000 Ljubljana, Slovenia. gregor.rot@fri.uni-lj.si|Faculty of Computer and Information Science, University of Ljubljana, SI-1000 Ljubljana, Slovenia. gregor.rot@fri.uni-lj.si|Faculty of Computer and Information Science, University of Ljubljana, SI-1000 Ljubljana, Slovenia. gregor.rot@fri.uni-lj.si