pgsql: First-draft release notes for 9.5.4.

First-draft release notes for 9.5.4.

As usual, the release notes for other branches will be made by cutting
these down, but put them up for community review first.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/3676631c687009c2fadcb35e7d312e9eb8a98182

Modified Files
--------------
doc/src/sgml/release-9.5.sgml | 929 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 929 insertions(+)

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