Research conducted under financial contribution of the EC under the contract No: EVK1-2000-22089.The research presented has been supervised by C. Giupponi, who co-ordinates the Mulino project.The contributions to this paper are the following
(indicated by the chapters): (1) C. Giupponi; (2) J.Mysiak, A. Fassio; (3) J. Mysiak; (4) A. Fassio, J. Mysiak, C. Giupponi; (5) C. Giupponi, J. Mysiak.