- Version bump to 4.0.2
  *Corrections for bugs that may harm simulation results:
   * A sign error in tabulated interactions was corrected such that
     the force equals the negative gradient of the potential.
     (#2519,2520)
   * The flow field of the CPU lattice-Boltzmann implementation was
     deleted when aspects of the molecular dynamics cell grid were
     changed; E.g., when interactions, the skin or the parallelization
     setup were changed. ESPResSo now terminates with an error, when this
     happens. To avoid this, please setup the CPU lattice-Boltzmann after
     all other aspects of the system. The GPU LB is not affected in the
     4.0 release, but was affected in the current development branch.
     (#2728, #2736)
   * Corrected the force acting on LB Boundaries for the case of
     agrid and density not equal to 1 (#2624).
   * Corrected the cutoff calculation for the soft sphere interaction. In
     the previous implementation, the offset parameter was ignored.
     (#2505)
   * The "three point coupling" of particles to the lattice-Boltzmann
     method has been removed. While it works in most environments, for
     some compilers the calculation gives wrong values. This is likely
     caused by undefined behavior. A corrected implementation is
     available in ESPResSo's development branch. It cannot be safely
     backported to 4.0.2, because the code has diverged too far. (#2516,
     #2517) Users who did not explicitly activate this coupling via
     couple="3pt" are not affected.
   * The velocity of existing particles was changed when setting or
     changing the simulation time step (#2480)
 * Further changes:
   * Fixed the electrokinetic Python interface (#2486)
   * Correction to the installation instructions for mac (#2510)
   * Corrected file permissions (#2470)
   * Minor corrections and extensions to the test suite (#2477, #2552)
   * Fixed a dead-lock in the dipolar Barnes Hutt method on the GPU for
     recent NVIDIA cards such as RTX 2080 (#2719).
   * Restored Mayavi visualizer's API-compatibility with OpenGL
     visualizer (#2751)

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