Cluster test: unit 08, update messages.
Cluster test: unit 09, Pub/Sub across the cluster.
Don't propagate SAVE.

This is a general fix (check that dirty delta is positive) but actually
should have as the only effect fixing the SAVE propagation to
AOF and slaves.
On AOF end of file, truncate the AOF to last valid command.

Recently we introduced the ability to load truncated AOFs, but
unfortuantely the support was broken since the server, after loading the
truncated AOF, continues appending to the file that is corrupted at the
end. The problem is fixed only in the next AOF rewrite.

This commit fixes the issue by truncating the AOF to the last valid
opcode, and aborting if it is not possible to truncate the file
correctly.
Seek at the end of AOF after truncate call.

It is not clear if files open in append only mode will automatically fix
their offset after a truncate(2) operation. This commit makes sure that
we reposition the AOF file descriptor offset at the end of the file
after a truncated AOF is loaded and trimmed to the last valid command.
Better truncated AOF loading tests.

Now there are tests to write more data after loading a truncated AOF,
testing that the loaded data is correct, appending more, and testing
again.
Improve disable save comment in redis.conf

Closes #1897
Remove surplus double quotes

Closes #1877
Update linenoise accessory files

The core linenoise code was being backported, but not
the README or example.  It's less confusing for users
if everything matches across directories.

Fix inspired by @thrig

Closes #1872
Fix many small typos

Closes #1871
Fix incorrect comments

error != success; and 0 != number of bytes written

Closes #1806
Fix typo in redis.conf

Closes #1713
Fix typo

Closes #1682
Fix typo in 00-RELEASENOTES

Closes #1673
Fix typo

Closes #1544
Fix typo: ad -> and

Closes #1537
Fix typos

Closes #1513
Grammar and typo fixes in redis.conf

Closes #1441
Fix typo in redis.h

Closes #1386
Fix on-place -> in-place

Closes #1373