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References
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* Boost http://boost.org
* ChemFig http://www.ctan.org/pkg/chemfig
* GGL http://www.tbi.univie.ac.at/software/GGL
* Graphviz http://www.graphviz.org
* LoLA http://www.informatik.uni-rostock.de/tpp/lola/
* Open Babel http://openbabel.org
* PNAPI http://service-technology.org/pnapi/index.html
* Sphinx http://sphinx-doc.org
* Tikz http://www.ctan.org/pkg/pgf