@raoufaghrout @robmiles rapidftr/tracker#136 Adding delete form section link at top of page, with unit and functional tests. Not styled yet.

This adds most of the functionality for issue 136. We are not sure about the location of the Delete link as described in the issue though, as this would put it inside the existing form that allows details of a form section to be edited. Still need to add the confirmation message on successful delete.