Re: earthdistance fixes, but no cube stuff

Patch applied. Thanks.

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Bruno Wolff III wrote:
> I have included fixes to declare some floating point constants as double
> instead of int, change the calculation method to use the haversine formula
> which is more accurrate for short distances, added a grant to public for
> geo_distance and added a regression test.
>
> I will resubmit the earth distance stuff based on cube after 7.3 is released.

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