setup.py: cosmetic fixes #155
Merged
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Based on #154 to avoid merge conflicts, please review/merge that first.
I ran some QA tools against setup.py to check that I hadn't done anything obviously wrong in #154, and they produced some unrelated warnings, most of which are fixed here.
setup.py: Remove unused imports
Detected by pyflakes3.
setup.py: Use PEP8 whitespace
Detected by pycodestyle.