Do we need subgraphs from BulgeGraph and CoarseGrainRNA

[Bernhard10]

bulge_graph.py has bg_from_subgraph, coarse_grain.py has cg_from_sg.

However, these methods do not copy the sequence information. This means that they do not pass the bulge_graph_test.GraphVerification Tests.

Subgraphs typically do not have a single continuous sequence.

Should we:

• Remove subgraphs entirely (and move the code to an example script)
• Improve them to make them biologically more consistent (we could make them member functions, so CoarseGrainRNA can inherit from BulgeGraph)
• Leave them as they are?

Note: fess/scripts/create_cylinder_intersection_measure.py usees subgraphs.