UpdateAddress.php should use cli.php

This is a substantial re-write of UpdateAddress.php that will break backward compatibility for anyone who is calling this file in a cron job (or other script).

It fixes two problems with UpdateAddress.php:

• Currently, UpdateAddress.php, when run from the command line, fails in a multi-site environment (with this patch, you can pass the -s argument to specify the site you want to run it against)
• Currently UpdateAddress.php, when run from the web on a default Debian Squeeze installation or any site in which register_argc_argv is turned off in the php.ini file

This script utilizes (and depends on) changes made to cli.php here: http://issues.civicrm.org/jira/browse/CRM-8565