Pyspeckle

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* attempt to fix images on pypi.org

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* drop 'v' from version tags
* add testing
* add conda support
* add github automated testing
* improve CITATION.cff
* create zenodo DOI
* add github automated version updates

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* add slice_plot() for 3D speckle
* create pure python packaging
* include wheel file
* package as python3 only

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* 3D speckle generation
* flake8 testing
* add pypi badge
* automate notebook testing

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* add badges for colab and binder
* sphinx-book-theme for docs
* cite SPIE paper
* improve README.rst

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* improve api generation using automodapi