Add image::thinclient.  Old stuff in new clothes.
Add image::bundle::thinclient, including a collection of packages
needed to build a thinclient.  Perhaps it is useful in other
contexts as well.
Rename image::bundle::thinclient to image::bundle::basic,
and use that from image::opinsys, image::puavo and image::thinclient.
Also, install Ubuntu-packages on image::puavo.
Wrap lines under 80 characters, make whitespace right.