Parent-within-parent
Parent-within-parent

- For nodes with phosphosites, store the main node in a parent.
- Store that parent within another parent, parent_2
- Put the little phospho nodes under parent_2
- Cose-Bilkent layout behaves better in this configuration and the phospho
  nodes are better distributed around the main node.
- If main node + little phospho nodes are placed under a single parent
  the distance between the phospho nodes and the main are not as uniform
- also did a few parameter tweaks to the cose-bilkent layout

pvtodorov/pathway_map_dynamic,pvtodorov/pathway_map_dynamic