switch to using `Function<Iterable<? extends Image>, Image>` as per @demobox 's 
suggestion, on the basis that:

* it is clearer what is actually required (thanks for persuading me!)
* it isn't that much more work to write
* it avoids any mathematical disasters if someone supplies an `Ordering` 
function which is not well-ordered (which on thinking about it should not be 
done if they are being consistent, but could be done by accident...)

also repair AWS tests (and rebase) and fix whitespace

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