Realalg

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* Fixed documentation badges.

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* Python 3.8 -- 3.12 supported.
* Can now compare algebraic number in different fields.

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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.