Interpolation with cubic splines

This is a Rust crate that implements interpolation with cubic splines. You choose a set of points and the boundary conditions, and the crate calculates a function that is continuous, has a continuous derivative and second derivative, and fits the given criteria.

For reference:

• https://en.wikiversity.org/wiki/Cubic_Spline_Interpolation
• https://en.wikipedia.org/wiki/Spline_(mathematics)
• https://en.wikipedia.org/wiki/Spline_interpolation