Address/Phone/Email CRUD access control

Should a Contact Detail have a field representing the Contact that "owns" it? This would make the access control logic simpler as we could just delegate to ContactAccessControlHandler. Should that field be read only (would that interfere with future sharing)?

I suppose we could still delegate to ContactAccessControlHandler without such a field, but it would require a query to find the Contact referencing the Contact Detail. I err on the side of setting a read only back reference as described above.

Adding a contact reference field is how I would implement Detail sharing; it shouldn't interfere.

If a contact field is added to the contact detail, the contact form(s) will need to be updated. The add form can not create contact details because the contact id does not exist yet.

I think it is a blocking issue, just something we will need to address.