Tighten the scope for the Bootstrap span4 bodge rule
Add an external link icon to the slug

This makes it clearer that the slug is a link to the content on the 
live site.
Make the archive view a separate page

This is in preparation for changing the button group to tabs.
Use tabs instead of the button groups

Following Maslow's change to use tabs instead of button groups, I'm 
going to abandon the change to remove tabs here.
Fix a unit test for the ArtefactsHelper
First pass at a new integration test for the edit form

This asserts that many elements of the form are displayed correctly.