Include package CMFCore for permission in configure.zcml

This dependence was necessary to correct this error:
Plone 4

...
zope.configuration.config.ConfigurationExecutionError: <class 'zope.component.interfaces.ComponentLookupError'>: (<InterfaceClass zope.security.interfaces.IPermission>, 'cmf.ManagePortal')
  in:
  File "/plone4/eggs/Products.windowZ-1.4.1-py2.6.egg/Products/windowZ/configure.zcml", line 14.2-19.8
    <browser:page
        for=".interfaces.IWindowZTool"
        name="edit"
        class=".controlpanel.WindowZControlPanelForm"
        permission="cmf.ManagePortal"
        />

thanks and regards