Bug 11559: Rancor: advanced cataloging interface

Bug 11559: Rancor: advanced cataloging interface

Full test plan is posted on bug. Test plan for system preference:

  1. Apply patch, clear cookies.
  2. Go to "Cataloging."
  3. Add new record, verify that basic editor is used.
  4. Navigate to existing record, click on "Edit record", verify that
     basic editor is used.
  5. Inside basic editor, verify that no button appears to switch to the
     advanced editor.
  6. Enable the "EnableAdvancedCatalogingEditor" syspref.
  7. Repeat above steps, should still go to basic editor, but button
     should appear to switch to the advanced editor; click it.
  8. Now, adding new records and editing existing records should go to
     the advanced editor.

Signed-off-by: Nick Clemens <nick@quecheelibrary.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>