[m-rev.] for review: float__pow: accept negative exponent; Russian peasants alg

[Fergus Henderson]

On 15-Mar-2002, Peter Moulder <pmoulder at csse.monash.edu.au> wrote:
> Let float__pow handle negative exponents.
> Use "Russian peasants" algorithm for float__pow and int__pow.
> New predicates int__even/1, int__odd/1.

I'm not entirely convinced that even/1 and odd/1 are sufficiently useful
to go in the standard library.  But I suppose they are pretty harmless.

Anyway, the rest of the diff looks fine.

-- 
Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
The University of Melbourne         |  of excellence is a lethal habit"
WWW: <http://www.cs.mu.oz.au/~fjh>  |     -- the last words of T. S. Garp.
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