Changes with nginx 0.8.43 30 Jun 2010

    *) Feature: large geo ranges base loading speed-up.

    *) Bugfix: an error_page redirection to "location /zero { return 204;
       }" without changing status code kept the error body; the bug had
       appeared in 0.8.42.

    *) Bugfix: nginx might close IPv6 listen socket during
       reconfiguration.
       Thanks to Maxim Dounin.

    *) Bugfix: the $uid_set variable may be used at any request processing
       stage.