Fixed bug in k(E) reverse rate determination.
Fixed bug in k(E) reverse rate determination.

I was using reactant and product densities of states where I should have been
using reactant and product equilibrium distributions. Needless to say this is
pretty wrong.

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