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

% Converts a gridfunction to a plot matrix
% Takes a grid function and and a structured grid.
function F = funcToPlotMatrix(g, gf)
    F = reshapeToPlotMatrix(gf, g.size());
end