The personal bar is hidden for anonymous users

This package was created for the usecase that we have a Plone site where is no user interaction. So we don't need a login possibility for all users, provided with the personal bar. But if someone is logged in it's very usefull to have the personal bar. So the personal bar is hidden to anonymous users, but show to authenticated ones.

Tested with Plone 4.0.4.

>>> from os.path import dirname, join
>>> from plone.app.testing import (
...     TEST_USER_NAME,
...     TEST_USER_PASSWORD,
... )
>>> from plone.testing.z2 import Browser
>>> browser = Browser(layer['app'])
>>> browser.handleErrors = False
>>> portal = layer['portal']

As an anonymous user we can't see the personal bar:

>>> browser.open(portal.absolute_url())
>>> '<a href="http://nohost/plone/@@personal-preferences">' in browser.contents
False
>>> '<a href="http://nohost/plone/dashboard">' in browser.contents
False

But after a login, it's there:

>>> browser.addHeader('Authorization', 'Basic %s:%s' % (TEST_USER_NAME, TEST_USER_PASSWORD,))
>>> browser.open(portal.absolute_url())
>>> '<a href="http://nohost/plone/@@personal-preferences">' in browser.contents
True
>>> '<a href="http://nohost/plone/dashboard">' in browser.contents
True

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