Configfetch

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**Fix:**

* Fix a few mistakes around ``setup.py`` (for pypi).
No changes in the code.

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**Change:**

* Rename builtin function name ``_path()`` to ``_fmt()``

* Remove unused ``Func.__init__()`` argument ``conf``

**Add:**

* Add document (readthedocs)

**Fix:**

* Improve value selection routine.
Now errors should be more consistent.

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* First commit