Log Message:
-----------
Update 9.0 release notes to current; add major items and introductory
text.
Modified Files:
--------------
pgsql/doc/src/sgml:
release-9.0.sgml (r2.15 -> r2.16)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/release-9.0.sgml?r1=2.15&r2=2.16)