MRG: use manysketch for sketching #15
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This PR changes the sketching code to use
manysketchinstead ofsourmash sketchfor metagenomes - which will hopefully be (much) faster for annoyingly large metagenomes.While simple in concept, this necessitates a lot of extra machinery 😅 :
which OK sounds simple but involves quite a few extra steps in practice!
We also introduce a diagnostic computation that shows datafile membership in the final sketches, as a confirmation.
Fixes #7