Add lower level for boot-strapping to RungeKuttaExteriorRV - Add a lower level to RungeKuttaExteriorRV for which bootstrapping starts, e.g start bootstrapping from time level 3 using a 3rd order BDF - Clean up ResidualViscosity

function benchmark(func, N)
    default_arg('N',100);

    tic
    profile on

    for i = 1:N
        func();
    end

    profile viewer
end