Uncertainty

[raoulcollenteur]

Initial methods to add uncertainty calculations to Pastas Models.

For example, uncertainty calculations are called as follows after model optimisation:

ml.fit.prediction_interval()
ml.fit.ci_simulation()

• An example is added (example_uncertainty.py)
• Tests are added (test_solvers.py)

[dbrakenhoff]

Looking good! I added a few minor comments, mostly about code style that apply to several of the new methods (not just where i added the comment):

• Do we hide internal methods in pastas by prepending _?
• Should docstrings for internal methods be as complete as for public methods?

[rubencalje]

Looks good. I do not have time to look into the code in detail though. Personally I would keep 'model' instead of 'ml', but if this helps to be consistent throughout Pastas it's better like this.

[dbrakenhoff]

@mbakker7, could you review this PR (if you haven't already)? I'd like to start using/testing it from the dev branch.