[plt-scheme] End-user instructions for upgrading single PLaneT package

I'd like to be able to write easy instructions for how an end-user can 
upgrade to the latest version of a particular PLaneT package that they 
have installed.

I do *not* want all PLaneT packages upgraded -- just this one.

Ideally, this would be something like telling the user to run the 
command "planet upgrade foo bar".

I don't see a way to do it without having the user look on the PLaneT 
Web site to see whether they have the latest version, and if not, then 
do "planet show" and then "planet remove foo bar" for the version shown, 
followed by the normal installation procedure.

I guess another option is to give the package a feature for upgrading 
itself, but I'd like to stay away from that fatness.

-- 
http://www.neilvandyke.org/