pgsql: Add a new, improved version of citext as a contrib module.

[tgl(at)postgresql(dot)org (Tom Lane)]

Log Message:
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Add a new, improved version of citext as a contrib module.

David E. Wheeler

Modified Files:
--------------
    pgsql/contrib:
        Makefile (r1.83 -> r1.84)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/Makefile?r1=1.83&r2=1.84)
        README (r1.96 -> r1.97)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/README?r1=1.96&r2=1.97)
    pgsql/doc/src/sgml:
        contrib.sgml (r1.8 -> r1.9)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/contrib.sgml?r1=1.8&r2=1.9)
        filelist.sgml (r1.56 -> r1.57)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/filelist.sgml?r1=1.56&r2=1.57)

Added Files:
-----------
    pgsql/contrib/citext:
        Makefile (r1.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/citext/Makefile?rev=1.1&content-type=text/x-cvsweb-markup)
        citext.c (r1.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/citext/citext.c?rev=1.1&content-type=text/x-cvsweb-markup)
        citext.sql.in (r1.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/citext/citext.sql.in?rev=1.1&content-type=text/x-cvsweb-markup)
        uninstall_citext.sql (r1.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/citext/uninstall_citext.sql?rev=1.1&content-type=text/x-cvsweb-markup)
    pgsql/contrib/citext/expected:
        citext.out (r1.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/citext/expected/citext.out?rev=1.1&content-type=text/x-cvsweb-markup)
    pgsql/contrib/citext/sql:
        citext.sql (r1.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/citext/sql/citext.sql?rev=1.1&content-type=text/x-cvsweb-markup)
    pgsql/doc/src/sgml:
        citext.sgml (r1.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/citext.sgml?rev=1.1&content-type=text/x-cvsweb-markup)