[Admins]

Looks quite good, may be we should add this on wiki.graal.net.
Two things:
- with the update packages people can only download files which they normally can do too, so it should not be any security problem
- available package modes: base - updates are checked at each login (can be slow if it contains many files), required - updates are checked if the local version differs, optional - only downloaded if the user downloads it, we will improve this soon though to display a special window where it tells you about optional updates (like new RCs)