[Espressomd-maintainer] [espresso] Use cartesian communicator for MPI communication. (#22)

[hoarak]

You can merge this Pull Request by running:

  git pull https://github.com/hoarak/espresso master

Or you can view, comment on it, or merge it online at:

  https://github.com/espressomd/espresso/pull/22

-- Commit Summary --

* Exchanged MPI_COMM_WORLD everywhere by cartesian communicator, and changed 
neighbor calculation to MPI functions for cartesian topology
* Split get_grid_index and get_rank_from_index
* Removed calc_3d_grid(), replaced by MPI functions.
* cosmetics
* ...
* p3m working with cart comm.
* layerd cs working with cart comm.
* maggs working with cart comm.
* Cleanup.
* changed communicator.
* Merge branch 'cartcomm'
* P3m-Dipolar working with cart comm and cleanup.

-- File Changes --

M src/cells.c (4)
M src/communication.c (456)
M src/communication.h (4)
M src/debug.c (2)
M src/domain_decomposition.c (12)
M src/elc.c (10)
M src/energy.c (2)
M src/errorhandling.c (3)
M src/ewald.c (8)
M src/fft-common.c (12)
M src/fft-dipolar.c (20)
M src/fft.c (29)
M src/ghosts.c (14)
M src/grid.c (64)
M src/grid.h (7)
M src/halo.c (6)
M src/iccp3m.c (34)
M src/integrate.c (14)
M src/layered.c (8)
M src/lb.c (26)
M src/lbgpu_cfile.c (12)
M src/maggs.c (68)
M src/mdlc_correction.c (8)
M src/mmm2d.c (10)
M src/molforces.c (44)
M src/nsquare.c (4)
M src/p3m-dipolar.c (24)
M src/p3m.c (22)
M src/particle_data.c (12)
M src/pressure.c (12)
M src/rattle.c (12)
M src/statistics.c (2)
M src/statistics_fluid.c (24)
M src/utils.h (21)
M src/verlet.c (1)

-- Patch Links --

  https://github.com/espressomd/espresso/pull/22.patch
  https://github.com/espressomd/espresso/pull/22.diff

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