Previously, there were two interfaces in the `OptimizationProblem` for calling evaluation functions (e.g. objectives): one for evaluating individuals, and one for populations.
To simplify the code base, these two methods were now unified.
To ensure backward compatibility, a 1D-Array is returned if a single individual is passed to the function.

Co-authored-by: r.jaepel <[email protected]>

Previously, the cadet path set in Cadet(install_path="path") was not inherited into cadet instances created from the run() method.

Fix and extend tests about .calculate_interstitial_rt/velocity

Previously, this was required because CADET-Core was not setting the
PATH correctly.
Now, this can lead to inconsistent behaviour.
Note, this requires CADET>4.4.0

Recently, the option to (not) plot the time axis using minutes was
introduced.
This commit fixes some methods that were not properly implemented.
Moreover, the name of the flag was changed from `use_minutes` to
`x_axis_in_minutes` to make clear that only plotting is affected and not
other parameter values (e.g. start and end times).

Co-authored-by: daklauss <[email protected]>

Updates and Fixes plot_at_position by adding start, end and
x_axis_in_minutes as parameters in solution.py

This is now handled by CADET-Python

CADET-Core now returns a 1D Vector (instead of a 2D where the second
dimension happens to only have one entry).

Adds n_par = 1 and ncol = 1 as test cases in test_cadet_adapter.

Replace link to default conda with link to mini-forge