History:

  V18.3 - Public release

     - MUA_NListtree_Quiet  does not work as  expected  (reported by Thomas
       Igracki, Thx!)
     - User defined compare- and findname-hooks crash! Fixed!  (reported by
       Thomas Igracki, Thx!)
     - Now, NListtree is really quiet if MUIA_NListtree_Quiet is set!
     - Reactivation of copied, moved and exchanged entries works better now.
     - OpenAutoScroll now  works as expected,  added  new config  item Open
       scroll (Thx to Matthias Bethke).


  V18.2 - Public release

     - Added multiselection feature
     - Fixed some small cosmetical problems
     - Implemented arrows as MUI images
     - Implemented Copy method
     - Implemented KeepStructure flag for recreation of the complete
       structure in Move and Copy


  V18.1 - Internal release

     - Completely rewritten graphics stuff. Now in all cases predefined and
       precreated images  where used.  This fixes many graphic bugs occured
       in the old 18.0.
     - After deleting an entry,  the old entry  remains internally  active.
       Using this entry crashed the machine. Fixed!
     - Moving   marker   with    the   cursor   keys   did    not   trigger
       MUIA_NListtree_Active. Fixed!
     - When deleting entries, MUIA_NListtree_Active was triggered two times.
       Fixed
     - Deleting  an  entry without  entries  in  the list  caused recursive
       function calling and stack overflow ;-) Fixed!
     - Insertion  had some bugs which  caused the machine to hang or crash.
       Fixed!


  V18.0 - Initial public beta release