Acknowledgments

The authors are especially grateful to:

• Keith S. Wilson (York, UK) one of the originators of the software;
• Zbyszek Dauter (Brookhaven, USA) for significant contributions to the software development.
• Eleanor Dodson (York, UK), Jozef Sevcik (Bratislava, SLO), Phil Evans (Cambridge, UK), Titia Sixma (NKI Amsterdam, The Netherlands), Erik van Asselt (Univ. Groningen, The Netherlands) and Rob Meijers (EMBL-Hamburg) for valuable suggestions.
• Christiane Blessing, Thomas Eriksson and Remi Pinck for computer and web support.
• Onno van Breemen, Marie Francoise Incardona and Serge Cohen, for their help in ongoing developments, which will be hopefully incorporated to the next release.