1. Faculty of Chemistry; University of Gdańsk, Wita Stwosza 63; Gdańsk 80-308 Poland
2. Institute of Computer Science, Polish Academy of Sciences, ul. Jana Kazimierza 5; Warsaw 01-248 Poland
3. Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46; Warsaw PL-02668 Poland
4. School of Computational Sciences; Korea Institute for Advanced Study, 85 Hoegiro, Dongdaemun-gu; Seoul 130-722 Republic of Korea