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