Programming for Speed - Nov22

[Iain-S]

These are the changes that @pwochner and I made before, during and after teaching module nine this autumn.

Broadly, the changes are

• Refactor the main mandel() function to try to make it more intuitive. This requires re-writing subsequent uses-of and performance-improvements-to this function so touches most of the notebooks.
• Add more examples and explanation to the 0th notebook, rather than assuming knowledge of the Mandelbrot set.
• Add exercises, in their own notebook.
• Move some lesson content to self-study notebook as there is too much to cover.
• Add introductory section on concurrency before parallelising with numba.

Pam, feel free to edit if I've missed any points.

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[jemrobinson]

Can you implement the changes from running black in CI?