An interface for atom container layout, and an adapter for the classic layout engine
Crude (partial) port of the graph layout code to start to work with atom containers
Remove an uneccessary reference to Graph in BlockEmbedding
Convert molecules to code
Fill out the constructor for graph object from atom container, and make an initial test
Make the embedder actually work for atom containers - turns out the PlanarBlockEmbedder does not need to know about the atom container