Make mpicomm to be an optional input variable#98
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When we use the stochastic physics in GFDL SHiELD model, we don't pass the MPI communicator into the three modified subroutines, as we don't want to add a MPI communicator into SHiELD physics to be able to call those subroutines. So we make the mpicomm an optional input variables and use MPI_COMM_WORLD, if mpicomm is not passed into the subroutines.