tests: introduce doctest_mock_ugettext to allow doctests of localized code Future doctests will require some extra mocking, as the code-under-test uses translation (ugettext aka '_') and its provider TurboGears2 needs a context. Avoid this complexity by mocking ugettext as the identity function. This is done by providing a pytest fixture 'doctest_mock_ugettext' that will mock uggettext in the module that uses the fixture.

# 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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