Auryn simulator

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====== Known Issues ======
 

  * Spike-loss and random crashes experienced with with process numbers that were not a power of two. (OpenMPI 1.4.3)
  * Random communication freezes for large messages (i.e. caused by synchronization in the network -> many spikes in short time intervals).  (OpenMPI 1.5.4)
  * Still getting random freezes when running v0.8.0-beta on Ubuntu 14.04 LTS with the stock openmpi (Open MPI 1.6.5) 

I traced the freezes to SyncBuffer at high firing rates or high synchrony. In most cases it seems as if some processes do not recover from MPI_Allgather when resending the buffer after an overflow. To reproduce run

<code>
mpirun -n 4 ./sim_background --dir /tmp --wee 0.17
</code>

or for instance

<code>
mpirun -n 4 ./sim_poisson --kappa 20000
</code>

Note, that -n 2 seems to work and 3 or 5 cause other weird problems. Looks like a bug in openmpi.
When compiled against MPICH these problems do not occur.