Transforms coordinates from Finnish Uniform Coordinate system (YKJ) to ETRS-TM35 according to JHS154 (http://www.jhs-suositukset.fi/web/guest/jhs/recommendations/154)
Assumes files kkjEUREFFINtriangulationVertices.txt, ETRS_TM35FIN_TO_KKJ.txt, KKJ_TO_ETRS_TM35FIN.txt can be found from script path. Files can be retrieved from http://coordtrans.fgi.fi/kkj_EUREF-FIN.jsp