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Timestep order

Matthieu Schaller requested to merge timestep_order into master

This is my last batch of changes regarding time integration.

  • Additional checks here and there that the particles are synchronized. Especially gpart.
  • Re-arranged the time-step sequence and simplified the logic in engine_step().
  • Moved the decision of repartitioning from the main() to engine_step().

The re-arrangement of the time-step sequence allows for perfect energy conservation even when we rebuild, repartition or dump snapshots. Previously that was not the case as a spurious drift had to be introduced.

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