Updated rmgpy.rmg.model.Species class due to changes in rmgpy.species.Species.
Updated rmgpy.rmg.model.Species class due to changes in rmgpy.species.Species.

Note that the former currently exists as place for methods that are
currently only used in RMG jobs, e.g. property estimation from the
database. Nonetheless it might still be better to merge these together.

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