When generating flux diagrams, generate pairs while loading Chemkin file.
When generating flux diagrams, generate pairs while loading Chemkin file.

This way we have the pairs information right away, in case we need/want to
use it for something before or during the ODE simulation.

chatelak/RMG-Py,enochd/RMG-Py,KEHANG/RMG-Py,nickvandewiele/RMG-Py,pierrelb/RMG-Py,nickvandewiele/RMG-Py,nyee/RMG-Py,nyee/RMG-Py,faribas/RMG-Py,comocheng/RMG-Py,enochd/RMG-Py,pierrelb/RMG-Py,faribas/RMG-Py,KEHANG/RMG-Py,chatelak/RMG-Py,comocheng/RMG-Py