pgsql-server: Allow optional SAVEPOINT keyword in RELEASE and ROLLBACK

Log Message:
-----------
Allow optional SAVEPOINT keyword in RELEASE and ROLLBACK TO, for greater
compliance with SQL2003 spec syntax.

Oliver Jowett

Modified Files:
--------------
pgsql-server/doc/src/sgml/ref:
allfiles.sgml (r1.60 -> r1.61)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/allfiles.sgml.diff?r1=1.60&r2=1.61)
rollback_to.sgml (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/rollback_to.sgml.diff?r1=1.1&r2=1.2)
savepoint.sgml (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/savepoint.sgml.diff?r1=1.1&r2=1.2)
pgsql-server/src/backend/parser:
gram.y (r2.469 -> r2.470)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/parser/gram.y.diff?r1=2.469&r2=2.470)
pgsql-server/src/backend/tcop:
utility.c (r1.223 -> r1.224)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/tcop/utility.c.diff?r1=1.223&r2=1.224)
pgsql-server/src/test/regress/expected:
transactions.out (r1.7 -> r1.8)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/test/regress/expected/transactions.out.diff?r1=1.7&r2=1.8)
pgsql-server/src/test/regress/sql:
transactions.sql (r1.7 -> r1.8)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/test/regress/sql/transactions.sql.diff?r1=1.7&r2=1.8)

Added Files:
-----------
pgsql-server/doc/src/sgml/ref:
release_savepoint.sgml (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/release_savepoint.sgml?rev=1.1&content-type=text/x-cvsweb-markup)

Removed Files:
-------------
pgsql-server/doc/src/sgml/ref:
release.sgml
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/release.sgml)