Pyscaffold

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- Fix problem with version numbering if setup.py is not in the root directory, :issue:`76`

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- Fix version conflicts due to too tight pinning, :issue:`69`

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- Fix installation with additional requirements ``pyscaffold[ALL]``
- Updated pbr version to 1.7

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- Allow different py.test options when invoking with ``py.test`` or
``python setup.py test``
- Check if Sphinx is needed and add it to *setup_requires*
- Updated pre-commit plugins
- Replaced pytest-runner by an improved version
- Let pbr do ``sphinx-apidoc``, removed from ``conf.py``, :issue:`65`

.. note::

Due to the switch to a modified pytest-runner version it is necessary
to update ``setup.cfg``. Please check the :ref:`example <configuration>`.

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- Format of setup.cfg changed due to usage of pbr, :issue:`59`
- Much cleaner setup.py due to usage of pbr, :issue:`59`
- PyScaffold can be easily called from another script, :issue:`58`
- Internally dictionaries instead of namespace objects are used for options, :issue:`57`
- Added a section for devpi in setup.cfg, :issue:`62`

.. note::

Due to the switch to `pbr <https://docs.openstack.org/pbr/latest/>`_, it
is necessary to update ``setup.cfg`` according to the new syntax.

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- FIX: Removed putup console script in setup.cfg template