view_article.html: - couple tweaks to the force parameters to keep all the nodes in the layout   - decrease the linkDistance from 60 -> 50   - decrease the repulsive charge of the main node and group 1 nodes from -1000 -> -900   - add a smidgen of gravity to pull things in just a bit
view_article.html:
- couple tweaks to the force parameters to keep all the nodes in the layout
  - decrease the linkDistance from 60 -> 50
  - decrease the repulsive charge of the main node and group 1 nodes from -1000 -> -900
  - add a smidgen of gravity to pull things in just a bit

whitews/PubMedVis,whitews/PubMedVis