Update 9.1 release notes to reflect commits through today.

Branch
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REL9_1_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/4eb4b4013d27eaa8bcbd089ce7a20f4bcb2556f3

Modified Files
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doc/src/sgml/release-9.1.sgml |   29 ++++++++++++++++++++++++++++-
1 files changed, 28 insertions(+), 1 deletions(-)

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