[m-rev.] for review: improve reporting of mode warnings

[Peter Ross]

On Mon, May 28, 2007 at 08:42:17AM +1000, Ian MacLarty wrote:
> For review by anyone.
> 
> Estimated hours taken: 5
> Branches: main
> 
> Only report mode warnings if they occur in all modes.
> simplify.m already had code to do this, so move this code to error_util.m and
> reuse it in modes.m
> 
This sentence suggests that the mode warning code already existed in
simplify, while it was only the code for checking for errors that occur
in all modes that you copied out.

Otherwise it looks fine.
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