to take two parameters.
Config module now uses camel case for method names for consistency
with other modules. Also SetTimezone is now called as soons as
a Config module is instantiated, so modules don't need to do it.
Backup method has been moved from Invoice module to Control module.
Invoice module now checks for a parent organisations when Cron is
called, and sends collated ordering information for child system_groups
to the configured email address for the organisation.
Organiser module now provides MatchParents method used by Invoice
module when checking for organisations.
notify table now has a 'public' column used by rss.php to only show
public items.
New Notification module can create private notifications.
User module can now take option user and group parameters so that
SESSION variable doesn't have to be changed.