[m-rev.] for review: more efficient operator lookups

[Julien Fischer]

On Mon, 25 Sep 2006, Zoltan Somogyi wrote:

> library/ops.m:
> 	Change the representation of operators to allow a single lookup to
> 	gather all available information about an operator.
>
> NEWS:
> 	Mention the change to ops.m.
>
> library/io.m:
> 	When writing out terms, use the new functionality of ops.m to look up
> 	the function symbol in the operator table just one (previously we did
> 	it up to five times).
>
> 	Rename some predicates to eliminate some ambiguities.
>

You may also need to update some of the files in the samples directory.

Julien.
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