Allow users to set elements public or private

[ehmatthes]

• [x] All elements, including the organization, are considered private first.
• [x] Toggling privacy
  • [x] Setting an element private cascades down the hierarchy.
  • [x] Setting an element public cascades up the hierarchy.
  • Implement on edit_sa_summary page? (check for cascading issues after processing form?)
  • [x] Write a separate test for this, because it's so critical.
• [x] Filter for privacy
  • [x] In read-focused views
• [x] Avoid confusion about 'public' referring to the political notion of a public school.

[ehmatthes]

• Added public attribute to Organization.
• [x] On organizations page, list:
  • orgs that user owns
  • orgs users has edit permissions on
  • public orgs
  • [x] test these

[ehmatthes]

• [x] Implement an organization_admin page.
  • [x] Based on OrganizationAdminForm(OrganizationForm)
  • [x] Allows editing of aliases
  • [x] Lists editors
  • Not modifying the editors quite yet, just listing them.
  • [x] Allows toggling of public attribute
  • [x] Setting private sets all elements in organization private
  • [x] Tests for all of this.
  • [x] Critical tests written
    • [x] Test that toggling org private works.
    • [x] Test that toggling org private cascades down to all elements.
  • [x] If test not written now, make a comment noting the specific test that needs to be written.
  • [x] Break this into two pages:
  • [x] organization_admin_edit; as currently coded, allows modifying the org.
  • [x] organization_admin_summary; just displays admin-related informatoin for org.

[ehmatthes]

• [x] Implement toggling of privacy on individual elements, on edit_summary page.
  • [x] for sa
  • [x] add checkbox on form for all elements; that way I can easily see if cascade is working properly.
  • [x] Write a test for ability to change sa to private, and that privacy cascades down.
  • [x] for sdas
  • [x] for cas
  • [x] for eus
  • [x] explain default cascading behavior
  • [x] privacy cascades down
  • [x] public cascades up
  • [x] cascade public down option
  • Not doing this for now, reticketed as #93.
  • [x] write basic security tests for all of these
  • [x] test that privacy works, and cascades down.
  • [x] test that changing public does not affect visibility of a private org.
  • [x] list non-security tests to write
  • tests about changing from private to public.