Managing state variables

[gaelder]

Many pathway instances have state variables that are ambiguous, distracting and often not very helpful.

PathwayCommons/pathways-search#98

[jvwong]

This arose again: I was interested in viewing some BioPAX in the app and seeing an entity pool node with state variable 'phosphorylated' - the entity also had a state variable 'active'. In this case 'active' was shown but not the 'phorphorylated'.

Need a way to either 1. show multiple OR 2. prioritize.

See PathwayCommons/pathways-search#98.

[jvwong]

Moving this to https://github.com/PathwayCommons/sbgnml-to-cytoscape/