pgsql: First rough cut at text search documentation: bare bones

Log Message:
-----------
First rough cut at text search documentation: bare bones reference
pages for the new SQL commands.  I also committed Bruce's text search
introductory chapter, as-is except for fixing some markup errors,
so that there would be a place for the reference pages to link to.

Modified Files:
--------------
    pgsql/doc/src/sgml:
        filelist.sgml (r1.49 -> r1.50)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/filelist.sgml?r1=1.49&r2=1.50)
        postgres.sgml (r1.81 -> r1.82)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/postgres.sgml?r1=1.81&r2=1.82)
        reference.sgml (r1.64 -> r1.65)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/reference.sgml?r1=1.64&r2=1.65)
    pgsql/doc/src/sgml/ref:
        allfiles.sgml (r1.71 -> r1.72)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/allfiles.sgml?r1=1.71&r2=1.72)
        comment.sgml (r1.35 -> r1.36)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/comment.sgml?r1=1.35&r2=1.36)

Added Files:
-----------
    pgsql/doc/src/sgml:
        textsearch.sgml (r1.1)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/textsearch.sgml?rev=1.1&content-type=text/x-cvsweb-markup)
    pgsql/doc/src/sgml/ref:
        alter_tsconfig.sgml (r1.1)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/alter_tsconfig.sgml?rev=1.1&content-type=text/x-cvsweb-markup)
        alter_tsdictionary.sgml (r1.1)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/alter_tsdictionary.sgml?rev=1.1&content-type=text/x-cvsweb-markup)
        alter_tsparser.sgml (r1.1)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/alter_tsparser.sgml?rev=1.1&content-type=text/x-cvsweb-markup)
        alter_tstemplate.sgml (r1.1)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/alter_tstemplate.sgml?rev=1.1&content-type=text/x-cvsweb-markup)
        create_tsconfig.sgml (r1.1)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_tsconfig.sgml?rev=1.1&content-type=text/x-cvsweb-markup)
        create_tsdictionary.sgml (r1.1)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_tsdictionary.sgml?rev=1.1&content-type=text/x-cvsweb-markup)
        create_tsparser.sgml (r1.1)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_tsparser.sgml?rev=1.1&content-type=text/x-cvsweb-markup)
        create_tstemplate.sgml (r1.1)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_tstemplate.sgml?rev=1.1&content-type=text/x-cvsweb-markup)
        drop_tsconfig.sgml (r1.1)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/drop_tsconfig.sgml?rev=1.1&content-type=text/x-cvsweb-markup)
        drop_tsdictionary.sgml (r1.1)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/drop_tsdictionary.sgml?rev=1.1&content-type=text/x-cvsweb-markup)
        drop_tsparser.sgml (r1.1)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/drop_tsparser.sgml?rev=1.1&content-type=text/x-cvsweb-markup)
        drop_tstemplate.sgml (r1.1)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/drop_tstemplate.sgml?rev=1.1&content-type=text/x-cvsweb-markup)