Make a cut at a major-features list for 9.2.

This is open to debate of course, but it's past time we had *something*
here.

Branch
------
REL9_2_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/d3337731277c3f65209fc39986627c66033812e9

Modified Files
--------------
doc/src/sgml/release-9.2.sgml |   92 ++++++++++++++++++++++++++++++++++++++--
1 files changed, 87 insertions(+), 5 deletions(-)

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Next:	From: Tom Lane	Date: 2012-08-23 03:56:46
	Subject: pgsql: Remove overly-pessimistic statement about constraint exclusion.
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	Subject: pgsql: Make an editorial pass over the 9.2 release notes.