Add deletes for:

  * Resources, archival objects
  * Digital objects, digital object components
  * Events
  * Subjects
  * Agents
  * Repositories
Added new endpoints for delete
Added delete buttons to the UI
Use AJAX for the suppress/delete actions (as button_to was breaking when inside another form element)
Fix delete actions when located on an edit template (tweak the util.js confirmation widget for inline forms to generate a form on the fly)
Tweak repo_code error message to get the i18n right
Added group deletion
Set the indexer page size to 50
Add support for deleting users
Switch i18n to the new scheme
Disable repository deletion for the time being