[m-dev.] hash_float() (was pragma fact_table)

[Fergus Henderson]

David Matthew OVERTON, you wrote:
> 
> Could someone please review this.
> 
> Estimated hours taken: 2
> 
> Prolog version of `float__hash'.
> 
> library/float.nu.nl
> 	Add a new predicate `float__hash'.  Note: this one computes a
> 	different hash value to the one in `float.m'.

That looks fine.  Please commit it.

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