Add KBI0011 (Debugging installation issues related to multiple Python versions) #43
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This KBI comes from two separate reports that originated from personal communication (e-mails from 07 Nov 2022 and 24 Mar 2023), one of which has been recorded in https://github.com/psychoinformatics-de/datalad-officehours/issues/7
Since the underlying issue in both cases was a clash between multiple Python installations (once between Psychopy-bundled and regular on Windows, once between homebrew and conda on MacOS) that wasn't immediately visible, I thought it would make sense to write this KBI.
Both reports are summarized as examples, and a closer explanation for some diagnostic commands is provided.