Deleted group fitting methods from KineticsGroups class.
Deleted group fitting methods from KineticsGroups class.

The fitGroupValues() method is being moved into the kinetics groups
generation script, in order to make that script more self-contained.
The fitGroupValuesFromOldLibrary() method was deprecated by the kinetics
groups generation script, and has been deleted for this reason.

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