textsearch-ja - textsearch_senna: The first scan should be run in

Log Message:
-----------
The first scan should be run in amgettuple or amgetbitmap instead of amrescan.
Add a regression tests for heavily-updated workload.

Modified Files:
--------------
    textsearch_senna:
        Makefile (r1.2 -> r1.3)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_senna/Makefile?r1=1.2&r2=1.3)
        textsearch_senna.c (r1.8 -> r1.9)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_senna/textsearch_senna.c?r1=1.8&r2=1.9)
    textsearch_senna/expected:
        textsearch_senna.out (r1.5 -> r1.6)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_senna/expected/textsearch_senna.out?r1=1.5&r2=1.6)
    textsearch_senna/sql:
        textsearch_senna.sql (r1.5 -> r1.6)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_senna/sql/textsearch_senna.sql?r1=1.5&r2=1.6)

Added Files:
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    textsearch_senna/data:
        update.sql (r1.1)

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

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