Orsopy

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* Revise .ort file header speicifcation according to ORSO discussions.
* Implement option for automatic unit conversion based on pint library
* Improve yaml export to support compact on-line layout for e.g. Value
* Add a ErrorColumn for clear separation between data and error columns
and allow specification of type/distribution of error with conversion
factors to get standard deviation (sigma)
* Add a ComplexValue class
* Fix some type conversions where e.g. lists have been converted to str

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* Merge the slddb package into orsopy for simple query of the database.
SLD db will transition to orsopy for its backend.

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* Fix a bug prventing usage of fileio on python >=3.10.1 due to changes in dataclasses internal API
* Replace the metaclass implementation by a decorator behaving similar to dataclass
* Add meeting minutes documenting ORSO decisions
* Define documentation how to auto-format code and execute on source
* More documentation improvements

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* Implement user_data from custom keyword arguments
* Improvements to documentation
* Backport to python 3.6 and 3.7
* Allow user defined spaces between multiple datasets

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* Integration of PyPI with Github build system

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* First release on PyPI as alpha version.