Styling for related links

Now adding related artefacts in panopticon will appear to the upper right of the finder.
![screen shot 2014-08-26 at 14 40 27](https://cloud.githubusercontent.com/assets/68009/4045190/7668e10a-2d27-11e4-81bc-56d3aee2884e.png)

This will allow MHRA to link between their two finders as per https://trello.com/c/ZhIa4h14/286-related-links-2