because portal_selection could not be used by anonymous users, remove some anonymous functionalities :
- anonymous users don't need to use selection.
- They also don't need to navigate between result pages
- they don't need to care which link is already reed or not in rss feed (because we need portal_selection for that)

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@31178 20353a03-c40f-0410-a6d1-a30d3c3de9de