ini: explain how % must be escaped as %% (Issue #375) Gearbox / paste would fail with: configparser.InterpolationSyntaxError: '%' must be followed by '%' or '(' The special handling of % is standard configparser behaviour, unless explicitly fetching raw settings.

# requirements.txt file for use as "pip install -r requirements.txt" as a
# readthedocs compatible alternative to "pip install -e ." which is a working
# alternative to "setup.py develop" which doesn't work with Mercurial 3.7
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