Add PetscReinitialize()

Issue #43 new
created an issue

Add a PetscReinitialize(MPI_Comm newcomm) where newcomm is a larger or smaller MPI communicator than PETSC_COMM_WORLD, which does whatever is needed to the PETSc global data structures so from that point on it as if PetscInitialize() had been called on the newcomm originally.

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