For QM/HBI radical estimates, evaluate each resonance isomer and choose lowest H.
For QM/HBI radical estimates, evaluate each resonance isomer and choose lowest H.

I think this is what was being done in RMG-Java.
Seems to make sense.
Closes #100

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