Use a better method for the derivative of the $b = -1$ polynomials #122
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In the formula
defining$\boldsymbol D_{(a, -1, c)}^{t, (a+1,0,c+1)}$  that I gave in #111, I was computing the triple matrix product using the bidiagonal conjugation stuff from InfiniteLinearAlgebra.jl. But it's just $\boldsymbol D_{\mathrm b, (a, 1, c)}^{t, (a+1,0,c+1)}$ , so I switch over to reusing the existing half-weighted derivatives.