Uncertainity

[DunklesArchipel]

Uncertainty is implemented in #78

This will be part of Quantity.

Uncertainty also appears in other contexts. For example, in Ph

        "Ph": {
            "type": "object",
            "additionalProperties": false,
            "properties": {
                "value": {
                    "type": "number"
                },
                "uncertainty": {
                    "type": "number"
                },
                "comment": {
                    "type": "string"
                },
                "calculation": {
                    "type": "string"
                }
            },
            "title": "Ph"
        },

The key calculation could be moved into quantity and pH is transformed into a quantity.

[DunklesArchipel]

We might want to update this later to be more compatible with other projects
See also:

• https://pint.readthedocs.io/en/0.10.1/measurement.html
• https://docs.astropy.org/en/stable/uncertainty/index.html
• https://pythonhosted.org/uncertainties/
• https://linkml.io/linkml/howtos/model-measurements.html