Moving PlotContainerEditor to ComponentEditor

The Traits editor in
enthought.chaco2.chaco2_plot_container_editor.PlotContainerEditor has
been moved to the slightly better named
enthought.enable2.component_editor.ComponentEditor since it really
displays Enable components, not just PlotContainers. The
PlotContainerEditor is deprecated and will raise a DeprecationWarning
when used for another 2 weeks, after which it will be removed from the
trunk.

--

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless
enigma that is made terrible by our own mad attempt to interpret it as
though it had an underlying truth."
 -- Umberto Eco