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Subset sorting

Pedro Gonnet requested to merge subset_sorting into master

Massive change in the way we treat sub-cell tasks and sorts in general, i.e.:

  • Sorts and drifts now unlock all sorts and drifts above them, this ensures they are executed bottom-up even if intermediate tasks are not active,
  • Sub-cell task hierarchies are traversed consistently during density/ghost/force computations,
  • Sub-cell tasks no longer do the drifting and sorting themselves,
  • Sorts are only re-computed once the oldest sorted index goes stale.
  • Ghosts exist at a lower level in the tree.

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