pgsql: Implement CREATE TABLE LIKE ...

Log Message:
-----------
Implement CREATE TABLE LIKE ... INCLUDING INDEXES. Patch from NikhilS,
based in part on an earlier patch from Trevor Hardcastle, and reviewed
by myself.

Modified Files:
--------------
    pgsql/doc/src/sgml/ref:
        create_table.sgml (r1.108 -> r1.109)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_table.sgml.diff?r1=1.108&r2=1.109)
    pgsql/src/backend/bootstrap:
        bootparse.y (r1.88 -> r1.89)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/bootstrap/bootparse.y.diff?r1=1.88&r2=1.89)
    pgsql/src/backend/commands:
        indexcmds.c (r1.160 -> r1.161)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/indexcmds.c.diff?r1=1.160&r2=1.161)
        tablecmds.c (r1.229 -> r1.230)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/tablecmds.c.diff?r1=1.229&r2=1.230)
    pgsql/src/backend/nodes:
        copyfuncs.c (r1.379 -> r1.380)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/copyfuncs.c.diff?r1=1.379&r2=1.380)
        equalfuncs.c (r1.310 -> r1.311)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/equalfuncs.c.diff?r1=1.310&r2=1.311)
        outfuncs.c (r1.312 -> r1.313)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/outfuncs.c.diff?r1=1.312&r2=1.313)
    pgsql/src/backend/parser:
        parse_utilcmd.c (r2.1 -> r2.2)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_utilcmd.c.diff?r1=2.1&r2=2.2)
    pgsql/src/backend/tcop:
        utility.c (r1.283 -> r1.284)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/tcop/utility.c.diff?r1=1.283&r2=1.284)
    pgsql/src/backend/utils/adt:
        ruleutils.c (r1.262 -> r1.263)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/ruleutils.c.diff?r1=1.262&r2=1.263)
    pgsql/src/include/commands:
        defrem.h (r1.81 -> r1.82)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/commands/defrem.h.diff?r1=1.81&r2=1.82)
    pgsql/src/include/nodes:
        parsenodes.h (r1.349 -> r1.350)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/nodes/parsenodes.h.diff?r1=1.349&r2=1.350)
    pgsql/src/include/utils:
        builtins.h (r1.297 -> r1.298)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/utils/builtins.h.diff?r1=1.297&r2=1.298)
    pgsql/src/test/regress/expected:
        inherit.out (r1.21 -> r1.22)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/inherit.out.diff?r1=1.21&r2=1.22)
    pgsql/src/test/regress/sql:
        inherit.sql (r1.10 -> r1.11)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/inherit.sql.diff?r1=1.10&r2=1.11)