Add a "Fix redirect" link action. It replace a redirect with a direct link. Basically, it's the same thing as the "Fix redirects" bulk action, but AJAX-based and for a single link.

This action is hidden by default and can be enabled in Settings -> Link Checker -> Advanced.

git-svn-id: https://plugins.svn.wordpress.org/broken-link-checker/trunk@1029434 b8457f37-d9ea-0310-8a92-e5e31aec5664