pgsql: CREATE TABLE IF NOT EXISTS.

Log Message:
-----------
CREATE TABLE IF NOT EXISTS.

Reviewed by Bernd Helmle.

Modified Files:
--------------
    pgsql/doc/src/sgml/ref:
        create_table.sgml (r1.128 -> r1.129)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_table.sgml?r1=1.128&r2=1.129)
    pgsql/src/backend/bootstrap:
        bootparse.y (r1.105 -> r1.106)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/bootstrap/bootparse.y?r1=1.105&r2=1.106)
    pgsql/src/backend/catalog:
        heap.c (r1.373 -> r1.374)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/heap.c?r1=1.373&r2=1.374)
        toasting.c (r1.32 -> r1.33)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/toasting.c?r1=1.32&r2=1.33)
    pgsql/src/backend/commands:
        cluster.c (r1.203 -> r1.204)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/cluster.c?r1=1.203&r2=1.204)
        sequence.c (r1.168 -> r1.169)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/sequence.c?r1=1.168&r2=1.169)
        tablecmds.c (r1.333 -> r1.334)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/tablecmds.c?r1=1.333&r2=1.334)
        typecmds.c (r1.148 -> r1.149)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/typecmds.c?r1=1.148&r2=1.149)
        view.c (r1.120 -> r1.121)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/view.c?r1=1.120&r2=1.121)
    pgsql/src/backend/executor:
        execMain.c (r1.352 -> r1.353)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/execMain.c?r1=1.352&r2=1.353)
    pgsql/src/backend/nodes:
        copyfuncs.c (r1.465 -> r1.466)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/copyfuncs.c?r1=1.465&r2=1.466)
        equalfuncs.c (r1.385 -> r1.386)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/equalfuncs.c?r1=1.385&r2=1.386)
        outfuncs.c (r1.386 -> r1.387)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/outfuncs.c?r1=1.386&r2=1.387)
    pgsql/src/backend/parser:
        gram.y (r2.713 -> r2.714)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/gram.y?r1=2.713&r2=2.714)
    pgsql/src/backend/tcop:
        utility.c (r1.335 -> r1.336)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/tcop/utility.c?r1=1.335&r2=1.336)
    pgsql/src/include/catalog:
        heap.h (r1.98 -> r1.99)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/heap.h?r1=1.98&r2=1.99)
    pgsql/src/include/nodes:
        parsenodes.h (r1.432 -> r1.433)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/nodes/parsenodes.h?r1=1.432&r2=1.433)
    pgsql/src/test/regress/expected:
        create_table.out (r1.15 -> r1.16)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/create_table.out?r1=1.15&r2=1.16)
        typed_table.out (r1.2 -> r1.3)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/typed_table.out?r1=1.2&r2=1.3)
    pgsql/src/test/regress/sql:
        create_table.sql (r1.10 -> r1.11)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/create_table.sql?r1=1.10&r2=1.11)
        typed_table.sql (r1.2 -> r1.3)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/typed_table.sql?r1=1.2&r2=1.3)