[m-rev.] for review: redundant brackets around types in error messages

[Ralph Becket]

Peter Wang, Wednesday, 15 April 2009:
> Does anyone know if this might cause problems?
> 
> 
> Branches: main
> 
> compiler/mercury_to_mercury.m:
> 	Don't write an outer pair of brackets when formatting terms with '.'
> 	or ':' as the functor, which made module-qualified types in error
> 	messages unnecessarily ugly.

I've been meaning to do this for years!  I can't see a problem with it.
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