Create residual viscosity package +rv and generalize the ResidualViscosity class - Generalize residual viscosity, by passing user-defined flux and calculating the time derivative outside of the update. - Create separate RungekuttaRV specifically using interior RV updates - Separate the artifical dissipation operator from the scheme AdvectionRV1D so that the same scheme can be reused for creating the diff op used by the ResidualViscosity class

function y = rickerWavelet(x, x0, A)
    y = (1-2*pi^2*A^2*(x-x0).^2).*exp(-pi^2*A^2*(x-x0).^2);
end