os.path and pathlib
There is a mix of os.path.join() calls and simple string concatenation throughout the code. Examples: getTests() versus make_datadir_subdirectory() in TorNet.py (also, just noticed the mixed camelCase and snake_case which might deserve its own style ticket).
I think we want to be consistent with path handling, but has pathlib been taken into consideration to make it more self-documenting where Chutney needs to deal with paths?
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