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Speed-up for large top-level grids

Merged Matthieu Schaller requested to merge planetary_speedup into master

These are some improvements to the space structure to speed-up MPI calculations and the planetary things:

  • We make a list of non-empty top-level cells,
  • We make a list of local non-empty top-level cells,
  • engine_drift_all() only loops over the local cells with tasks (instead of all the grid),
  • space_split() only loops over the local non-empty cells,
  • space_regrid() only loops over the local non-empty cells to figure out h_max.
  • The top-level gravity task only loops over the non-empty cells.
Edited by Matthieu Schaller