full path to the required nodes (if use_names is true, then it must start with '/'), or null
if true, then tree_path will be interpreted as a unix style path, and if false, then tree_path will be interpreted similarly to the #GtkTreePath's string representation.
a new list of #GdaTreeNode pointers, free it with glib.slist.SList.free
The returned list is a list of all the #GdaTreeNode nodes <emphasis>below</emphasis> the node at the specified path.
As a corner case if tree_path is null, then the returned list contains all the top level nodes.