Extend tests to higher numbers of nodes and other rules about integratorxx HOT 5 CLOSED

However, the Chevyshev rules are analytic, so the tests don't need to be as extensive compared to those of Legendre and Lobatto that actually involve root finding...

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@susilehtola I have a workstation working on this now, but if you're already working on it, I can cancel the jobs. Let me know.

See #52 for a tentative fix. I changed the nodes again since I realized that the increments should be always odd; the script in that PR is up-to-date but the files still need to be regenerated. I am running the generation on my laptop, but that might finish by tonight.

I am pretty sure we don't need to check every order. So far, the tests looked clean up to 500 points!

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Just to note that having this in place will be useful if we move faster algorithms for e.g. Gauss-Legendre ala

SIAM J. Sci. Comput., 36 (2014), C1008–C1026.

https://github.com/cenit/jburkardt/tree/master/fastgl

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@susilehtola I have a workstation working on this now, but if you're already working on it, I can cancel the jobs. Let me know.

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This will be closed by #52

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