Update release notes for 9.1.5, 9.0.9, 8.4.13, 8.3.20.

Branch
------
REL9_0_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/99f093b0f869930417756b0a35a06d20c7ffa91d

Modified Files
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doc/src/sgml/release-8.3.sgml |  223 ++++++++++++++++++++++++++++++
doc/src/sgml/release-8.4.sgml |  234 +++++++++++++++++++++++++++++++
doc/src/sgml/release-9.0.sgml |  306 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 763 insertions(+), 0 deletions(-)

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