Refactor code, apply linter, and unify style of docstring

[constantinpape]

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[schilling40]

For postprocess_seg.py the creation of a table with _compute_table() in postprocessing.py currently fails because of different lengths of the arrays when creating the dataframe. I will investigate which arrays should be a different length tomorrow. The current implementation of the function only allows the use of a single spatial statistics function, which is probably sufficient without more sophisticated approaches.

[constantinpape]

For postprocess_seg.py the creation of a table with _compute_table() in postprocessing.py currently fails because of different lengths of the arrays when creating the dataframe. I will investigate which arrays should be a different length tomorrow.

I went ahead and fixed this and also added a small test. While doing this I noticed that there's one other discrepancy, we can quickly discuss tomorrow.

The current implementation of the function only allows the use of a single spatial statistics function, which is probably sufficient without more sophisticated approaches.

Yeah, I think that's sufficient for now. We can extend this later if necessary.