Add a tab for 'Broken Links' as part of the node tabs

Problem/Motivation

I think it would be good to have a tab for "Broken Links" alongside the View | Edit | Delete | Etc tabs, so you can see any broken links on a per node basis.

To this end, I created the Link Checker Per Node module, which extends this module (it's basically an extra view with a contextual filter).

Feel free to merge that view into this module, or close this issue if that's not something you want to support in this module.