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

% Takes a symfun and makes a better anonymous function
function fun = matlabFunctionSizePreserving(f)
    mf = matlabFunction(f);
    args = argnames(f);

    funStr = func2str(mf);
    for i = 1:length(args)
        funStr = [funStr sprintf(' + 0*%s', toString(args(i)))];
    end

    fun = str2func(funStr);
end