Changes:
    - added a Department model whose instances belong to an org and require name.
    - added a DepartmentController and views for create, edit/update and a index view which is a tab
      of 'Organisational Details'.
    - added the optional attribute department_id to User model.
    - added Rspec tests.
    - updated app/controllers/registrations_controller.rb, app/models/org.rb and
      app/models/user.rb to get rid of outstanding Rubocop warnings

    Fix for issue #2088.

fixed issue with public plans template sort

* added new form validation error handling

added tests for orgs controller

converted over remaining controllers to new errors

enhanced message handlers in application controller

finished form validations

* fixed rubocop for all controllers

* Fix broken specs

- Factories needed to be updated to meet new validation requirements
- Spec was broken since error message had changed

* Fix errors and warnings from npm audit

public DMPs templates paginablerised. DMPRoadmap/roadmap#1055

plans visible to org admin paginablerised. DMPRoadmap/roadmap#1055

guidances paginablerised. DMPRoadmap/roadmap#1055

guidance_groups paginablerised. DMPRoadmap/roadmap#1055

remove tablesorter class from paginable views. Introduce Clear search results when ALL search results are active. DMPRoadmap/roadmap#1055

guidance policy for paginable/guidance/index/:page. DMPRoadmap/roadmap#1055