Add chebyshev interpolation - #72
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This PR adds a Chebyshev-Lobatto nodal representation for stability polynomials and optional interpolation constraints in RK-Opt.
This work is based on my master's thesis on optimized explicit Runge-Kutta methods for multiscale problems.
I will submit the thesis in a few days and can send the PDF afterwards, either directly or through Hendrik Ranocha.