[plt-scheme] using PLaneT

I installed 301 on my PowerBook (I'd been making do with 300 for a 
while) and decided to try using PLaneT for the first time, to load Jim 
Bender's WebIt!, version 2.0. I put the necessary "require (planet ...) 
into my code, but it was run via a shell script invoked from the command 
line, which failed with a permissions error. I had to run it using sudo 
to get the download to occur, and then my code was horribly slow. 
Running setup-plt (also under sudo) compiled WebIt! (plus some other 
collections which didn't seem to be compiled) and my code was much 
faster after that. Is it supposed to be this complicated? --PR