Fix invalid structural object class chains in test schema

Includes rewriting of URLs where the DN of the referral object
and the DN of the ref attribute attribute are not the same.
Also, always returns explicit DN and scope.
Currently, back-ldbm only.  Needs to be ported to back-bdb.

Developed by Julius Enarusai/IBM
Copyright IBM Corp. 2001

Use of this source code is subject to the terms of The OpenLDAP
Public License Version 2.7, 7 September 2001.  No trademarks of the
IBM Corporation are to be used to identify, endorse or promote any
products derived from this code without the prior written consent
of IBM.

Remove ssf from slapd-schema.conf

the existing database "directory" directive) to allow setting
of a DB_ENV directory.  Should likely be database specific.

detect inet_ntop (for MacOSX)

one set of slapd.conf files.

Needs to be tied into index mask and backend search code.

Add additional notices.  Likely need to add a quiet mode.