Updated stella machine Makefile to reflect transition to MPICH (instead of OpenMPI)
Updated stella machine Makefile to reflect transition to MPICH (instead of OpenMPI)

liuqx315/Sundials,liuqx315/Sundials,liuqx315/Sundials,liuqx315/Sundials,liuqx315/Sundials,liuqx315/Sundials