Moved Cantera updating to end of reaction model enlarging.
Moved Cantera updating to end of reaction model enlarging.

This is because we don't know the thermo and kinetics for all reactions until
the end (since we restructured the flow to do them all at once).

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