Tweak to species constraint allowed molecule list.
Tweak to species constraint allowed molecule list.

I'm not 100% sure we've generated resonance isomers at this point,
so this change may not be enough, but I feel we should allow all resonance
forms of an allowed species.
chatelak/RMG-Py,enochd/RMG-Py,KEHANG/RMG-Py,KEHANG/RMG-Py,nyee/RMG-Py,chatelak/RMG-Py,nickvandewiele/RMG-Py,nickvandewiele/RMG-Py,pierrelb/RMG-Py,faribas/RMG-Py,enochd/RMG-Py,faribas/RMG-Py,nyee/RMG-Py,pierrelb/RMG-Py,comocheng/RMG-Py,comocheng/RMG-Py