pgsql: Rename hstore => text[] operator to % This is not yet in any

Log Message:
-----------
Rename hstore => text[] operator to %

This is not yet in any released version, so we still have the option to
change the name.  We may want to reserve the token => in a future release.

Modified Files:
--------------
    pgsql/contrib/hstore:
        hstore.sql.in (r1.13 -> r1.14)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/hstore/hstore.sql.in?r1=1.13&r2=1.14)
        uninstall_hstore.sql (r1.9 -> r1.10)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/hstore/uninstall_hstore.sql?r1=1.9&r2=1.10)
    pgsql/contrib/hstore/expected:
        hstore.out (r1.6 -> r1.7)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/hstore/expected/hstore.out?r1=1.6&r2=1.7)
    pgsql/contrib/hstore/sql:
        hstore.sql (r1.6 -> r1.7)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/hstore/sql/hstore.sql?r1=1.6&r2=1.7)
    pgsql/doc/src/sgml:
        hstore.sgml (r1.9 -> r1.10)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/hstore.sgml?r1=1.9&r2=1.10)