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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.

Avoid using sys_errlist unless there's no other choice

After initial contact, don't exit if a server goes down.
Also, don't wait forever for responses, use a timeout and
mention when a timeout occurs.
Simplify csn/sid handling, we know the max we expect so just
allocate the space in advance and keep a fixed sid to slot
mapping.

Use the correct database entry instead of the frontendDB entry

Performance improvement for indexed attributes removal

Calling from backend.c only works if back-monitor is a static backend

If HAVE_SYS_ERRLIST is false, nothing uses them anyway, so the
declarations serve no purpose. Just breaks the compile if the
library actually defines them (and we are avoiding using them).

Previous commit could cause cmdline cookie to be ignored

If the "" glue entry exists and lacks a contextCSN, must perform
an additional search to be sure the DB is otherwise empty. If so,
skip creating the contextCSN.

Don't resume pending ops unless there are no other threads
waiting to write

Solaris stdio hates NULL pointers

Was overlooked in a0cc1d96

valgrind didn't like accesses to si->si_connaddr
Also fix an array bounds check in ITS#9282 merge_state