Add support for artificial viscosity to the 1d burgers scheme. - Add support for artificial viscosity by parametrizing the discretization operator and boundary closure on the viscosity. - Add a time stepper which evaluates and updates the residual viscosity of the solution.

classdef (Abstract) OpSet
    properties (Abstract)
        borrowing % Struct with borrowing limits for different norm matrices
        m % Number of grid points.
        h % Step size
        x % Grid
    end

end