This work was supported by the Virtual Institute VI-146 of Helmholtz Gemeinschaft, Germany, Korea Research Foundation (KRF-2008-313-C00200), the Hungarian Scientific Research Fund (OTKA 68506), the Polish Ministry of Science and Higher Education (N N202 3956 33), the Federal Agency of Education of the Ministry of Education and Science of the Russian Federation (grant RNP 2.2.2.2.1547) and the Russian Foundation for Basic Research (grant 08-02-00018), the Ministry of Education, Culture, Sports, Science and Technology, Japan, Grant-in-Aid for Scientific Research (18071005, 19034011, 19740162), Swiss Nationalfonds Foundation 200020-117913/1 and ETH Reseach Grant TH-01 07-3.