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node_del shifts nodes around, cursors pointing at fake pages
need to have their mc_pg[0] corrected.

Some destination fixups need to happen immediately after nodes
are moved, before rebalancing

Log the same pointer in queue_csn as graduate_

Prevent spurious contextCSN generation
and ignore consumers when we have no contextCSN yet.
But make sure to propagate valid contextCSN updates to
accesslog/syncprov for delta consumers.

Windows mutexes are recursive so the trylock test will succeed
even though the mutex is already locked. Just compare be pointers.

The tree height can also increase during rebalance, not just shrink.
This can happen if update_key needs to split a parent branch page.

extended ops

Basic ops except abandon and unbind; since they get no reply
it's not important for the caller to know their msgID.

Schema parsing ignores some slapd.conf rules

In 2.4 syncrepl was changed to take its TLS defaults from the slapd
configuration (commit 1cc1f9b1) and the man page was updated to document
that (commit 27dd7a53). This updates the admin guide to match.