Graphviz

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Added example for HTML-like labels (``structs.py``).

Added ``Source`` class for rendering verbatim DOT source code.

Added Python 2.6 support (pull request Jim Crist).

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Added the ``pipe()``-method directly returning the ``stdout`` of rendering.

Added ``_repr_svg_()`` for inline rendering in IPython notebooks.

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Added examples generating some of the graphs from the Graphviz Gallery.

Added sphinx-based API documentation.

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Added support for HTML-like labels.

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Added support for less common output formats. Removed dropped formats (``'dia'``, ``'pcl'``).

Added ``'osage'`` layout engine.

Documented ``format`` and ``engine`` options in the README.

The ``view()`` convenience method now returns the result file name (like render()).

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Added ``attr()`` method for inline switching of node/edge attributes.

Added ``subgraph()`` method (obsoletes separate ``Subgraph`` class).

Add ``cleanup`` option to ``render()``.

Replaced ``dry`` option on ``render()`` with separate ``save()`` method.

Removed undocumented ``append()`` and ``extend()`` methods (if needed, the ``body``
attribute can be edited directly).