doc/source: Big documentation reorganisation.

Due to the new C++ API and because I wanted to include some tutorials,
the documentation is now seperated into 4 sections:

	library   => Documentation of modules.
	tutorials => Tutorials for using python-apt and contributing
	whatsnew  => Release notes
	c++       => Documentation,Tutorials for the C++ API

This commit also includes a new overview page, like the Python
documentation.

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