Comment 16 for bug 787162

Reviving discussion about this bug since we've recently had a customer who needed to make a change to an acnc row, nowadays the most straightforward way to create an admin interface would be to

1. Teach it PCRUD create, delete, and update permissions so that PCRUD can do more than just retrieve rows. I propose ADMIN_CALL_NUMBER_CLASS with global_required="true".
2. While we're in the area in fm_IDL.xml, mark required fields as required.
3. Add an Angular global admin landing page entry.