Tabular2xls

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- Add read the docs documentation and published on pypi
- Removed mandatory dependency on cbsplotlib
- Included extra unit test

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- CBS colors are recognized and translated
- update setup for pyscaffold 4

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- Possibility to specify search/replace patterns
- By default, $\cdot$ is replaced by '.' replace and $\ast$ with '*'

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- Unit test added
- Suppressed regex warning

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- Initial design of the tool