* Clean up the explicit imports from enthought.traits.ui.wx within the
    modules 'enthought.traits.ui.tk.helper.py' and 'enthought.traits.traits.py'

* See if we can refactor the ui/tree_node.py use of
    enthought.resource.api.resource_path as it is the only reason this
    component depends on enthought.resource.

* Figure out (clean up?) why enthought/traits/ui/tk/ui_wizard.py imports from
    wx *AND* why enthought/traits/ui/tk/ui_panel.py imports from wx as well.
    Should we just completely EOL the enthought.traits.ui.tk package?  At
    least we should move it to its own egg.

* Can't use doctests with traits until some cleanup is done of the docs.  In
    particular, enthought.traits.has_traits.HasTraits kills doctest.

* Fix the tests that pop-up interactive GUI's so that they don't do so.  These
    pop-ups mean the tests can't be run automatically and finish.

