blocku_xCD2B2

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Computes the second-order central difference approximation to the first-order space derivative with second-order biased approximation for boundary points.
By using the Newton-Gregory backward polynomial we obtain

For second-order central difference approximation, we need to fit the polynomial through the three points
x_i-1, x_i, x_i+1. This means to write the polynomial for example around the point x_i+1, drop the higher-oder terms and set s = -1 to obtain

For the boundary point x₁ we use biased formula and obtain

By using the same idea we obtain a biased formula for the boundary point x_n

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