[Biopython] sequence coordinate mapping

[Reece Hart]

Thanks, all, for feedback. I'm still digesting some of the previous 
comments. For the purposes of discussion, I've attached the crude 
(pre-crude, even) implementation that I mentioned.

Caveats/ToDos:
* The interface is sufficient for my needs, but for a large number of 
CDS subfeatures, it might make sense to change the implementation index 
rather than linear search.

* I ignore strand for the moment.

* I don't use SeqFeature.AbstractPosition and friends.

-Reece

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