Update the sorting mini-howto

[Andrew Dalke]

I wrote:
> Years ago I wrote the Sorting mini-howto, currently at
>
>   http://www.amk.ca/python/howto/sorting/sorting.html

Thanks to amk it's now on the Wiki at
   http://wiki.python.org/moin/HowTo/Sorting

so feel free to update it directly.

					Andrew
					dalke at dalkescientific.com