pgsql: GSSAPI documentation

Log Message:
-----------
GSSAPI documentation

Modified Files:
--------------
    pgsql/doc/src/sgml:
        client-auth.sgml (r1.98 -> r1.99)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/client-auth.sgml.diff?r1=1.98&r2=1.99)
        config.sgml (r1.130 -> r1.131)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/config.sgml.diff?r1=1.130&r2=1.131)
        installation.sgml (r1.289 -> r1.290)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/installation.sgml.diff?r1=1.289&r2=1.290)
        libpq.sgml (r1.237 -> r1.238)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/libpq.sgml.diff?r1=1.237&r2=1.238)
        protocol.sgml (r1.67 -> r1.68)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/protocol.sgml.diff?r1=1.67&r2=1.68)