Jaraco.fabric

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Fixed ``context`` parameter of ``upload_template``.

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Added files routines.

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Package refresh.

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Switch to `pkgutil namespace technique
<https://packaging.python.org/guides/packaging-namespace-packages/#pkgutil-style-namespace-packages>`_
for the ``jaraco`` namespace.

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Fixed issue where ``apt.add_ppa`` would fail if the PPA
was already present. Better to be idempotent.

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Refreshed package.