WIP: Resolve "SBGN - activity flow"
Closes #486
For reference: http://sbgn.github.io/sbgn/referencecards
TODO:
- Add NotOperator to model
-
Add DelayOperator to model - Add Activity element to model
- Add Perturbation element to model
- Draw Auxiliary Units according to SBGN standard
- Support the concept of an equivalence arc
-
Support submaps -
Discuss the difference between AF Compartment and Complex - Write a bazillion tests