ITS#3593 addpartial overlay

[hyc@symas.com]

I haven't had a chance to review this yet but it sounds like it would be 
worth incorporating this into the syncrepl consumer. Since the syncrepl 
protocol replicates whole entries, the consumer can waste a lot of time 
re-indexing values that never changed. Hopefully will get to this soon.

-- 
  -- Howard Chu
  Chief Architect, Symas Corp.  http://www.symas.com
  Director, Highland Sun        http://highlandsun.com/hyc
  OpenLDAP Core Team            http://www.openldap.org/project/