additional visualizations

[pverkind]

1. heatmap for every milestone in book1 in the one-to-all visualization (filterable)
2. alternative pairwise visualizations

• Lorenz's scatter plot

3. alternative many-to-many visualizations:

• circos viz (synteny viewer: e.g. https://syntenybrowser.jax.org/browser, D3 chord and D3 ribbon)
• network viz
• multi-pairwise viz

4. cluster exploration

• search: see David's cluster exploration (https://clusters.viraltexts.org/)
• by section/milestone in a book
• multitext div