[sources] Simplify source's init method
Only call it when enabled instead of giving a boolean flag indicating whether it
is or not (which were not correctly considered).
.. -*- coding: utf-8 -*-
.. _Part4:
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Appendixes
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The following chapters are reference material.
.. toctree::
:maxdepth: 1
:numbered:
faq
rql/index
mercurial
depends
docstrings-conventions