Added :class:`tkinter.ttk.Treeview` methods wrapping the enhanced
``ttk::treeview`` widget commands added in Tk 9.1 (and the ``detached`` query
added in Tk 9.0): item navigation and queries, opening, hiding, sorting and
searching of items, and cell focus, selection and tagging.  The
:meth:`~tkinter.ttk.Treeview.expand` and :meth:`~tkinter.ttk.Treeview.collapse`
methods (without recursion) also work on Tk older than 9.1.
