Add "disclose" and "manage" ACL levels (but no meat).

Add "disclose" and "manage" ACL levels (but no meat).

Disclose permission intended to be used for "disclose on error"
(as in our present "none"), none being "don't disclose on error".

Manage permission is intended to be used to allow DSA IT management
(e.g., changing entryCSNs, structuralObjectClass, etc.).