textsearch-ja - textsearch_senna: Implements restrict selectivity

Log Message:
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Implements restrict selectivity function for %% and @@ operators.
The result records are cached in planner, and reused in executor.
There are no additonal index scans as long as index scan is used (not seq scan).

Modified Files:
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textsearch_senna:
textsearch_senna-8.2.sql.in (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_senna/textsearch_senna-8.2.sql.in.diff?r1=1.1&r2=1.2)
textsearch_senna-8.3.sql.in (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_senna/textsearch_senna-8.3.sql.in.diff?r1=1.1&r2=1.2)
textsearch_senna-8.4.sql.in (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_senna/textsearch_senna-8.4.sql.in.diff?r1=1.1&r2=1.2)
textsearch_senna.c (r1.4 -> r1.5)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_senna/textsearch_senna.c.diff?r1=1.4&r2=1.5)
textsearch_senna/expected:
textsearch_senna.out (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_senna/expected/textsearch_senna.out.diff?r1=1.2&r2=1.3)
textsearch_senna/sql:
textsearch_senna.sql (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch_senna/sql/textsearch_senna.sql.diff?r1=1.2&r2=1.3)