pgsql: Add TABLESPACE and ON COMMIT clauses to CREATE TABLE AS.

Log Message:
-----------
Add TABLESPACE and ON COMMIT clauses to CREATE TABLE AS. ON COMMIT is
required by the SQL standard, and TABLESPACE is useful functionality.
Patch from Kris Jurka, minor editorialization by Neil Conway.

Modified Files:
--------------
    pgsql/doc/src/sgml/ref:
        create_table.sgml (r1.99 -> r1.100)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_table.sgml.diff?r1=1.99&r2=1.100)
        create_table_as.sgml (r1.31 -> r1.32)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_table_as.sgml.diff?r1=1.31&r2=1.32)
    pgsql/src/backend/commands:
        prepare.c (r1.47 -> r1.48)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/prepare.c.diff?r1=1.47&r2=1.48)
    pgsql/src/backend/executor:
        execMain.c (r1.265 -> r1.266)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/execMain.c.diff?r1=1.265&r2=1.266)
    pgsql/src/backend/nodes:
        copyfuncs.c (r1.326 -> r1.327)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/copyfuncs.c.diff?r1=1.326&r2=1.327)
        equalfuncs.c (r1.262 -> r1.263)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/equalfuncs.c.diff?r1=1.262&r2=1.263)
        outfuncs.c (r1.267 -> r1.268)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/outfuncs.c.diff?r1=1.267&r2=1.268)
        readfuncs.c (r1.183 -> r1.184)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/readfuncs.c.diff?r1=1.183&r2=1.184)
    pgsql/src/backend/parser:
        analyze.c (r1.328 -> r1.329)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/analyze.c.diff?r1=1.328&r2=1.329)
        gram.y (r2.529 -> r2.530)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/gram.y.diff?r1=2.529&r2=2.530)
    pgsql/src/include/nodes:
        parsenodes.h (r1.300 -> r1.301)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/nodes/parsenodes.h.diff?r1=1.300&r2=1.301)
    pgsql/src/test/regress/expected:
        temp.out (r1.10 -> r1.11)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/temp.out.diff?r1=1.10&r2=1.11)
        without_oid.out (r1.5 -> r1.6)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/without_oid.out.diff?r1=1.5&r2=1.6)
    pgsql/src/test/regress/input:
        tablespace.source (r1.2 -> r1.3)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/input/tablespace.source.diff?r1=1.2&r2=1.3)
    pgsql/src/test/regress/output:
        tablespace.source (r1.2 -> r1.3)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/output/tablespace.source.diff?r1=1.2&r2=1.3)
    pgsql/src/test/regress/sql:
        temp.sql (r1.6 -> r1.7)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/temp.sql.diff?r1=1.6&r2=1.7)
        without_oid.sql (r1.5 -> r1.6)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/without_oid.sql.diff?r1=1.5&r2=1.6)