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Basic infrastructure for black holes

Matthieu Schaller requested to merge black_holes into master

Apologies in advance for the monster push...

This adds support for black hole particles. We can:

  • Read BHs from ICs,
  • Write BHs to snapshots,
  • Exchange Bhs over the network,
  • Put the BHs in the correct cells,
  • Integrate them forward in time.

This should not break any of the simulations we do until now and the EAGLE-low-z examples should run with the new runtime flag --black-holes. This ought to work with and without MPI.

Actual tasks using the BHs will follow but having this in place first is helpful.

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