message: Added PetscSolver::GetComm() method
diff: @@ -533,6 +533,9 @@ public:
  /// Conversion function to PetscObject.
  operator PetscObject() const { return obj; }
  + /// Get the associated MPI communicator
  + MPI_Comm GetComm() const { return PetscObjectComm(obj); }
  +
  protected:
  /// These two methods handle creation and destructions of
  /// private data for the Solver objects
  