textsearch-ja - textsearch_groonga: Support VACUUM and add a test for

Log Message:
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Support VACUUM and add a test for parallel updates.
Fix a bug to initialize scan keys.

Modified Files:
--------------
    textsearch_groonga:
        Makefile (r1.2 -> r1.3)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_groonga/Makefile?r1=1.2&r2=1.3)
        textsearch_groonga.c (r1.6 -> r1.7)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_groonga/textsearch_groonga.c?r1=1.6&r2=1.7)
        textsearch_groonga.sql.in (r1.5 -> r1.6)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_groonga/textsearch_groonga.sql.in?r1=1.5&r2=1.6)
    textsearch_groonga/expected:
        textsearch_groonga.out (r1.7 -> r1.8)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_groonga/expected/textsearch_groonga.out?r1=1.7&r2=1.8)
        update.out (r1.1 -> r1.2)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_groonga/expected/update.out?r1=1.1&r2=1.2)
    textsearch_groonga/sql:
        textsearch_groonga.sql (r1.6 -> r1.7)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_groonga/sql/textsearch_groonga.sql?r1=1.6&r2=1.7)
        update.sql (r1.1 -> r1.2)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_groonga/sql/update.sql?r1=1.1&r2=1.2)

Added Files:
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    textsearch_groonga/data:
        bench.sql (r1.1)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_groonga/data/bench.sql?rev=1.1&content-type=text/x-cvsweb-markup)
    textsearch_groonga/expected:
        bench.out (r1.1)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_groonga/expected/bench.out?rev=1.1&content-type=text/x-cvsweb-markup)
    textsearch_groonga/sql:
        bench.sql (r1.1)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_groonga/sql/bench.sql?rev=1.1&content-type=text/x-cvsweb-markup)