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This adds support for the -x option which limits the amount of space
allocated for connections on systems
with very high open file limits.
Signed-off-by: Lorenz Brun <lorenz@brun.one>

Also fix up the example for replacing the memberOf overlay

Broken in 2c0499ae adding nesting

Just skip normalization if there's no equality rule. We accept
DNs without equality rules already.

We should probably just check in dnNormalize instead, and catch
this everywhere DNs are received. It might make us reject some
DNs that are already in use, though (e.g. received from other
directory servers that don't do schema checking).

if the entryCSN is older. Previous patch breaks if writes are
received out of order, e.g. during a refresh.

This check is only needed for ops received without a CSN in their cookie.
This only occurs when the ops completed out of order on the provider.

This mostly reverts commit 1915cb96.
Too many concurrency issues. Retains the improvement to
syncprov_sessionlog_cmp

Don't truncate trailing zeroes in reqStart/reqEnd timestamps

Saves about 20% CPU time and RAM

Fix logmsg uuidstr.
Shortcut finding start of playback.
Allow dup CSNs in log, but with different UUIDs. All
non-present deletes in a refresh use the same CSN.