Setupmeta

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* Don't issue warnings related to versioning on fresh new (still empty) repos

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* Don't do full auto-fill when invoked with ``--name``

* Added tests, do not try to follow relative paths in ``requirements.txt`` (pip doesn't accept them anyway)

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* Avoid infinite recursion with ``setup.py --name``

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* Report package name in ``setup_requires`` when possible,
for local projects referred to via ``-e /some/folder`` in a requirements file

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* Corrected auto-abstract for non-standard version pins such as ``foo==1.0-rc1+local-part``

* Added more debug tracing to help troubleshoot future issues (``SETUPMETA_DEBUG=1 setup.py ...``)

* Warn if no ``packages`` or ``py_modules`` are defined (empty package)

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* Added support for nested requirements: ``-r foo.txt`` will be now followed