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Gravity splittask (non-MPI)

Matthieu Schaller requested to merge gravity_splittask into master

This implements task splitting for gravity. Changes are:

  • Split large gravity tasks (self and pair)
  • Replace gravity pair tasks that are far enough with a multipole-multipole task.
  • Re-order operations in a time-step.

The last item has been a long-running accuracy issue as we were always running a time-step after detecting that a rebuild is needed.

The task-splitting is currently not enabled over MPI. I will make this work alongside the periodic gravity over MPI in the next merge request.

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