Add form classes to related link fields

* Fields don’t use formtastic so didn’t inherit the Bootstrap styles
* Labels are no longer display block, so there needs to be a line break
after the link label
Cleanup need ID form

* Bootstrap 3 defaults didn’t fit well with the existing custom CSS for
the need input form
* Tweak margins and input spacing to maintain previous look and feel
* Avoid styling using IDs
Put some spacing between artefact submit buttons

* Try and avoid accidental clicks
Update Bootstrap grid hacks on artefacts form

* Remove references to old spanX classes
* Hack is simpler now, rows aren’t fluid so we only need to remove the
grid padding