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Zoom 8: Isolating hydro particles to the zoom region.

William Roper requested to merge zoom_convert_hydro into zoom_merge

This MR implements the minimal modifications necessary to ensure hydrodynamics work with a zoom region (hydro tasks are already made solely in the zoom region).

This includes:

  • Converting a part, spart, or bpart to dark matter if they exit the zoom region.
  • Removing a sink that exit the zoom region.
  • Converting a part, spart, or bpart to dark matter if they reached h_max to remove long running neighbour searches in the presureless boundary.
  • Reporting the minimum possible density enforced by h_max during set up.

This needs some more tests run with a full subgrid model but I've raised the MR so it can be commented on.

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