Make a copy of the data upon adding

Should this simple one-liner already solve #22 (closed) ? Please check. If it does not, please provide a minimum working (well, failing) example for me to test, thanks!

changed milestone to %publish as v2.0.0 on pypi

added Bug label

requested review from @FObersteiner

assigned to @christophknote

if DataStore[...].data has a copy of the data (not a view), do we need to create another copy in denanify?

Yes, we do, bc. we only denanify for writing output to file / stdout. The data itself should still have np.nans. Firstly, bc. this (or masking them) is the way to treat missing values in a numpy array, and, secondly, we might want to write out multiple times and should, for consistencies sake not change the dataset in the meantime.

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• 4472d96b - 1 commit from branch mbees:master
• 8e63fb9e - Make a copy of the data upon adding

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merged