Realalg

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* Update for new SymPy rational syntax.
* Iteratively tries allocating more memory for CyPari.
* Now using GitHub Actions for CI/CD.

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* More accurate interval--rational multiplication.

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* Removed Python 2 support.
* Added minimum Python dependency version.

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* Fixed bug where eigenvectors were not checked that they are non-negative.

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* Fixed accuracy bug found by JZung.
* Using tighter intermediate accuracy resulting in increased performance.

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* Switched from using polcoeff to polcoef in pari libraries.