Add decrement lone pair atomtypes for 'C' and 'Cs' atomtypes.
Add decrement lone pair atomtypes for 'C' and 'Cs' atomtypes.

For reactions with carbene or carbon atom.

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