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Mesh gravity speed-ups

Matthieu Schallerrequested to merge
parallel_mesh into master

Implements two improvements:

  • Use the threadpool to apply the Green function in the PM part of the code
  • Use an asynchronous all-reduce to communicate the mesh across the MPI ranks.

To implement the second part, I have removed the call to space_split() that was in space_rebuild(). The space_split() is now called after the communication has been initiated.

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