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

% Get the index of the points p within the tall array of points ps
function [I, ok] = pointIndex(p, ps)
    [ok, I] = ismember(p,  ps, 'rows');
end