prelim FAQ update: Installation Instructions

[DJ Delorie]

> Thanks!  I'll fix that.  On a related note, is it harmful to have the
> latest/README file together with setup.exe in the "empty temporary
> directory" for an internet download?  I instruct users to download
> both files, but I don't say whether to get rid of README before
> Internet Setup can begin, in case both files were downloaded to the
> same directory.  DJ, what's your forward-looking statement about that?

I'll probably make the "empty" check look only for subdirectories and
.tar.gz files.  I don't see why other files would interfere with the
installation, so there's no need to warn about them.