warn-redundant-constraints present as errors

[Alan & Kim Zimmerman]

This is a great feature, here is some feedback

My syntax highlighter in emacs expects warnings to have the word "warning"
in them.

So for the two warnings reported below, the first is highlighted as an
error, and the second as a warning


Language/Haskell/Refact/Utils/TypeUtils.hs:3036:17:
    Redundant constraint: SYB.Data t
    In the type signature for:
       duplicateDecl :: SYB.Data t =>
                        [GHC.LHsBind GHC.Name]
                        -> t -> GHC.Name -> GHC.Name -> RefactGhc
[GHC.LHsBind GHC.Name]

Language/Haskell/Refact/Utils/TypeUtils.hs:3045:7: Warning:
    Defined but not used: ‘toks


This is in a ghci session, and the file loads without problems, so it is
indeed a warning.

Can we perhaps add the word "Warning" to the output for Redundant
constraints?

I also had a situation where it asked me to remove a whole lot of
constraints from different functions, I did them in batches, so did not
remove them all from the file at once, and at some point I had to add at
least one of them back, albeit based on an error message.


Regards
  Alan
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