textsearch-ja - textsearch-ja: Update copyright and add documentation.

Log Message:
-----------
Update copyright and add documentation.

Modified Files:
--------------
    textsearch-ja:
        COPYRIGHT.textsearch_ja (r1.1 -> r1.2)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch-ja/COPYRIGHT.textsearch_ja.diff?r1=1.1&r2=1.2)
        README.textsearch_ja (r1.7 -> r1.8)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch-ja/README.textsearch_ja.diff?r1=1.7&r2=1.8)
        encoding_eucjp.c (r1.3 -> r1.4)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch-ja/encoding_eucjp.c.diff?r1=1.3&r2=1.4)
        encoding_utf8.c (r1.4 -> r1.5)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch-ja/encoding_utf8.c.diff?r1=1.4&r2=1.5)
        textsearch_ja.c (r1.6 -> r1.7)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch-ja/textsearch_ja.c.diff?r1=1.6&r2=1.7)
        textsearch_ja.h (r1.4 -> r1.5)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch-ja/textsearch_ja.h.diff?r1=1.4&r2=1.5)
    textsearch-ja/doc:
        index-ja.html (r1.4 -> r1.5)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch-ja/doc/index-ja.html.diff?r1=1.4&r2=1.5)
        index.html (r1.4 -> r1.5)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/textsearch-ja/textsearch-ja/doc/index.html.diff?r1=1.4&r2=1.5)