Manuel

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- Include*.md files in wheel
These are needed by the test suite, which is also included in the wheel.
- Fix tests on python3.11
- Update some web links
- Update pyinstaller to 6.1.0 for python >= 3.11 support
- doctest: use outputchecker argument also in debug mode.
Fixes 38
- Remove references to old "six" module

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- Remove silly PyPI version badge.

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- Modernize internal project structure; drop tox; no user-visible changes (hopefully).
- Rework coverage badge generation.
- Drop Travis CI badge (the project is using GitHub for CI now)

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Fix missing file in release.

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Fix brown-bag release.

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- Fix test detection in Python 2 which was broken since 1.10.0.
(`20 <https://github.com/benji-york/manuel/issues/20>`_)
- Add Python 3.9 and 3.10 to tox config.
- Add a Makefile to centeralized development activities.