sample setup "version chooser"

[DJ Delorie]

> >Ok.  I think that setup should still warn if the user tries to not
> >install something that we have deemed to be part of the complete
> >package, though.
> 
> That doesn't mean that the stuff is "mandatory".  I just wanted to
> give someone pause if they decided not to download those packages.

How about just a tag on the chooser that says if the package is
recommended or not?  So far, we'd have the following tags for
installability:

action: require
	recommend
	install
	skip

> Maybe this is a round tuit feature if we see massive confusion on
> the cygwin mailing list.

Could be.