First pass at new artefact form.

Specific ODI fields added back in, deleted some shit to make it clearer what code is actually being used.
Make wells look less rubbish

Maybe it's just me, but I find that Bootstrap's wells look a bit
wishy-washy. I've removed the box shadow, made the border darker and
removed the rounded corners.
Tidy up the related items fields

- Make it clearer that related artefacts can be sorted
- Make both related artefacts and related links look similar
- Fix some of the spacing issues

Conflicts:

	app/assets/stylesheets/application.scss
	app/views/artefacts/_form.html.erb

Add in modules-group and module back in.
Attempt to tidy up tag fields
Add a label to indicate the state of the artefact
Add separate history view and archive modal box
Tone down buttons
Tweak form styles a bit

Based on feedback from @markhurrell, I've removed the borders from
nested items (like related artefacts and sections), moved the
button group from the far right-hand side to next to the title, and
bodged the Bootstrap proportions so that there isn't such a big
gap between the two columns.

Conflicts:

	app/assets/stylesheets/artefacts/form.scss
Indentation and label moving