- Bugfix: pass the node by reference in path_nodeapi so that $node->path is set
  for the node.  Fixes bug #3680.  Patch by Matt.

- Bugfix: when creating a new node, don't try to insert a path if it wasn't set
  in the node form.  This destroys any paths which the user may have created
  ahead of time for that node.  Patch by Matt.