do not allow the path to return to the original atom
do not allow the path to return to the original atom

in find_4_atom_3_bond_end_with_charge_path

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