Edited abstract for more clarity, still in the 250 word limit

Boud's suggestions in the previous commit were great and really helped in
improving the tone of the abstract (and thus the whole paper shortly!),
better putting it in the big picture. I had forgot to give the exact word
limit (which was 250), so Boud had set it to a very conservative value of
190, I added around 22 words to better highlight the points we want to
make, while still being below the limit.

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