Adding expansion command to SEPI pattern reduction command
The SEPI pattern reductions should be cleaned up and augmented with a reverse expansion command.
For instance hill5expanded.bc is a manual expansion of the CRN generated by stabilize_expression for Hill5 where the catalytic reactions are expanded into 3 reactions making explicit the intermediary complex
This is important for comparison to MAPK models which do represent intermediary complex. hill5expanded.bc