- Fixed inconsistent behavior of 'node_save()' and simplified the
  algorithm a bit. --> Needs testing!  I improved this last night
  and only got around to testing this rather briefly/quickly.  It
  was to late already. ;-)

  (This is part of a larger set of changes I'm slowly working on
  which I will feed to CVS in steps after more testing.)

- Added 2 new node functions called 'node_attribute_edit()' and
  'node_attribute_save()' used to 'hook in' any indexing system
  including your home-brewed stuff if you'd want to.