[PATCH] improve error messages in grub-setup

[Robert Millan]

This patch improves error messages in grub-setup, and adds a few
warnings when requested to install in odd layouts.

Since there was no facility to emmit a warning that is always
visible (regardless of verbosity), but doesn't abort execution,
I added one (grub_util_warn ()).  Is everyone fine with using
this interface?

-- 
Robert Millan

  The DRM opt-in fallacy: "Your data belongs to us. We will decide when (and
  how) you may access your data; but nobody's threatening your freedom: we
  still allow you to remove your data and not access it at all."

embedding_warnings.diff
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