A2SERVER's setup no longer takes the -os or os arguments (the security
paradigm shift suggests this is unnecessary and even unwise), and it's
time to actually install the debupdate script.
The replacement update mechanism will be a script installed on your
system. The advantage of downloading the update mechanism before
running it is that it allows you to upgrade the upgrade mechanism.
Naturally the disadvantage is that you have to download it. Debian
systems have a mechanism for this; we'll use it.
It's understandable why you might want to pull this off a server in case
how you have to upgrade things changes for some reason, but we're moving
toward following Debian's lead on these things to the greatest extent
possible.
