Acknowledgements

  - Gilles Masson for his great NList.mcc
  - Stefan Stuntz for fantastic MUI
  - Members of MUI@OneList.com for interresting informations
  - Alessandro Zummo for some interesting information about MUI (MUIUndoc)
    (which does not mean, that NListtree uses undocumented features).
  - Henning 'Lemming' Thielmann for intresting informations and suggestions
    for multiselection and moves/copies
  - and all others who have sent bug reports and suggestions