Reorganized handling of computations to fill ark_rwt array -- now it is updated every time the full RHS is updated, *before* the RHS is updated with a mass-matrix solve to instead provide dy/dt.
Reorganized handling of computations to fill ark_rwt array -- now it is updated every time the full RHS is updated, *before* the RHS is updated with a mass-matrix solve to instead provide dy/dt.

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