Added a purge method to status that will remove any status information for
modules that are no longer loaded (due to them being removed from the config
file and resmon being reloaded). This required $status to become global so it
was accessible from the reload_modules command.
git-svn-id: https://labs.omniti.com/resmon/trunk@109 8c0face9-b7db-6ec6-c4b3-d5f7145c7d55