Don't try to save StatesModel when saving frequency database.
Don't try to save StatesModel when saving frequency database.

The StatesModel class was deprecated and deleted as part of this refactor
branch. Nothing in the frequency database used it anyway, so the answer
for now is simply to delete the ability to save items in that manner.

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