reorg - pg_reorg: Supports CREATE EXTENSION.

Log Message:
-----------
Supports CREATE EXTENSION.

I've changed lib/Makefile to support CREATE EXTENSION.
In order to work with previeous PostgreSQL version (i.e. < 9.1),
this implementation installs both pg_reorg--1.0.sql and pg_reorg.sql.

This patch lacks regression testcases for CREATE EXTENSION, which I will commit soon.

Modified Files:
--------------
    pg_reorg/lib:
        Makefile (r1.8 -> r1.9)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/reorg/pg_reorg/lib/Makefile?r1=1.8&r2=1.9)

Added Files:
-----------
    pg_reorg/lib:
        pg_reorg--1.0.sql (r1.1)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/reorg/pg_reorg/lib/pg_reorg--1.0.sql?rev=1.1&content-type=text/x-cvsweb-markup)
        pg_reorg--unpackaged--1.0.sql (r1.1)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/reorg/pg_reorg/lib/pg_reorg--unpackaged--1.0.sql?rev=1.1&content-type=text/x-cvsweb-markup)
        pg_reorg.control (r1.1)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/reorg/pg_reorg/lib/pg_reorg.control?rev=1.1&content-type=text/x-cvsweb-markup)