Useful comments and tests of the code performed by M. Bender, H. Molique,
W. Satu
a, and T.R. Werner are gratefully acknowledged. This research was supported in
part by the Polish Committee for Scientific Research (KBN) under Contract
No. 2 P03B 040 14, by the French-Polish integrated actions programme
POLONIUM, and by the computational grant from the Interdisciplinary Centre
for Mathematical and Computational Modeling (ICM) of the Warsaw University.