Different link style for page with no view rights given context/user

In a wiki with various levels of collaboration, it would be nice if links to pages the user doesn’t have view rights on appeared differently so that the user doesn't have to click on the link, get a denied message, and then navigate back to the originating page.

Vincent has proposed a few ways to do this here: https://forum.xwiki.org/t/wiki-url-normalizer-1-1-released/364/14?u=ben.megson