Half join tactic - #840
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Preliminary attempt at a half join tactic, allowing one to accept ~abstract containers and batches, with their interpretation handled behind traits that can be boxed up if needed. As with reduce and join, the tactics are meant to allow others to implement narrower logic that avoids too much of the dataflow stuff, although in this case there is a bit more shuffling around than otherwise (e.g. the ill-named
BatcherAltto peel off eligible updates for the tactic to then work with, to avoid making it be stateful).