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More cosmology work

Matthieu Schaller requested to merge cosmo_io into master

This is a large package of changes mostly affecting i/o of quantities for cosmological runs.

This implements #407 (closed) and #404 (closed).

In details, this adds:

  • Cosmological evolution of the softening lengths.
  • Creation of gas particles from the DM ones.
  • Setting a minimal temperature for the gas.
  • Re-scaling of the velocities read in for cosmology.
  • Drifting of the velocities for the snapshots.
  • Output of the potential in the snapshots.
  • Changes the EAGLE_* example scripts to use cosmological time integration by default.

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