Department of Computer Science, ICube, CNRS, University of Strasbourg, Strasbourg, France. Electronic address: thompson@unistra.fr. Department of Computer Science, ICube, CNRS, University of Strasbourg, Strasbourg, France. Electronic address: raymond.ripp@unistra.fr. Department of Computer Science, ICube, CNRS, University of Strasbourg, Strasbourg, France; Unité de Microbiologie Structurale, Institut Pasteur, CNRS, 75724, Paris Cedex 15, France; Université Paris Diderot, Sorbonne Paris Cité, 75724, Paris Cedex 15, France. Electronic address: mayer@pasteur.fr. Department of Computer Science, ICube, CNRS, University of Strasbourg, Strasbourg, France. Electronic address: olivier.poch@unistra.fr. Department of Computer Science, ICube, CNRS, University of Strasbourg, Strasbourg, France. Electronic address: c.michel@unistra.fr.