When initialising model, add nonreactive species first.
When initialising model, add nonreactive species first.

This seems arbitrary, but it seems to increase the
chance of the Cantera simulations running correctly.

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