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

Branch
------
REL9_2_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/333a54a584c6f85d586ea0ee36013c1506892dd6

Modified Files
--------------
doc/src/sgml/release-8.3.sgml |  223 ++++++++++++++++++++++++
doc/src/sgml/release-8.4.sgml |  234 +++++++++++++++++++++++++
doc/src/sgml/release-9.0.sgml |  306 ++++++++++++++++++++++++++++++++
doc/src/sgml/release-9.1.sgml |  387 +++++++++++++++++++++++++++++++++++++++++
4 files changed, 1150 insertions(+), 0 deletions(-)

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