[plt-scheme] uninstalling .plt packages in 299

> Yes. Simply running Setup PLT after you delete the collection should
> work fine.
> 
> In other words, "info-domain" is not a registry in the Windows sense.
> It's more like the old Mac OS desktop cache; it needs to be up-to-date
> for things to work, but you can rebuild it at any time by running Setup
> PLT.

Just to be clear, you can rebuild it by first deleting the cache and 
*then* running Setup PLT, or will Setup PLT automatically overwrite it?

Thanks,
Dave