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Gravity multi dt

Matthieu Schaller requested to merge gravity_multi_dt into master

Some improvements to the gravity code:

  • Corrected typo in 4th order vector powers.
  • Use a user-defined opening angle for the distance checks.
  • Increase accuracy of the exact gravity calculation.
  • Only do exact gravity calculation if a matching result file is not present in the same directory.
  • Reinstate the dumping of individual task timers.
  • Added script to plot the accuracy of the calculation.
  • Crash if the M2L kernel is called with a length smaller than the softening length.

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