the protocol (draft-zeilenga-ldup-sync-04)

	- memory based session history to minimize sync traffic
	- when client is covered by a session history, then
      [add+delete] mode is used
	- when client cookie is not covered by the history because
      the cookie is too outdated and/or the history is truncated,
	  [add+present] mode is used
2. Sync cookie syntax : comma separated name=value pairs
	- csn=yyyymmddhh:mm:ssZ#0xSSSS#r#ssssr,sid=nnn

changed the test scripts and test conf files accordingly

Slapadd treated these as separate, incorrect, entries.

a task in the queue without removing it.

Restructure syncrepl/persist to use outbound connection manager.

Fix DIT rules to allow extensibleObject in AUX
unifdef -DSLAP_EXTENDED_SCHEMA

at end of do_syncrepl; this fixes the problem of syncrepl never starting
if the master isn't up. Set sync interval to 60 seconds in persist mode;
it will retry connecting to the master when the master isn't up. Fail on
SASL at config time instead of at runtime when SASL is not enabled.