WIP: Download henke tables#9

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anatoli-ulmer wants to merge 10 commits intomainfrom

Commits on Aug 4, 2022

Commits on Aug 5, 2022

Add functionality that checks whether henke data is existent in the user directory and downloads and saves the data if this is not the case. Needs to be tested.
anatoli-ulmer
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Commits on Aug 8, 2022

Commits on Aug 9, 2022

Commits on Sep 30, 2022

Fixed some errors in the cross section functions.
anatoli-ulmer
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