automatic uidnumber overlay version 0.2

Please find attached version 0.2 of the uidnumber overlay I posted previously (http://www.openldap.org/lists/openldap-software/200806/msg00029.html).

This version does not search the directory every time a posixAccount add entry request comes in - only the first time such a request is made to the directory. Subsequent requests are processed via the cached next uidNumber overlay data. This version of the overlay tracks the next uidNumber per database (the previous version used a static, overlay scoped variable).

Just posting in case anyone ever finds it of use for their environment.

jr