The OEClearAromaticFlags function is equivalent to the following code.
void MyClearAromaticFlags(OEMolBase &mol)
{
OEIter<OEAtomBase> atom;
for (atom = mol.GetAtoms();atom;++atom)
atom->SetAromatic(false);
OEIter<OEBondBase> bond;
for (bond = mol.GetBonds();bond;++bond)
bond->SetAromatic(false);
}