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)