Fixing bug in multiwrite with multiple MPI writes #37
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This fixes a bug in my use case where particles were not being output correctly for RHybrid+corsair in restart files. Previously simulations would either quietly write out particles in nonsense locations leaving large empty gaps in the correct file offset or die with a segfault, depending on the MPI implementation (OpenMpi, intel mpi). This was triggered anytime a processor had more than the number of particles that would correspond to the systems MaxBytesPerWrite.