bool OEBondIsInRingSize(const OEBondBase &atm, unsigned int size)
Determine whether the given bond is in a cycle of the specified size.
The function OEFindRingAtomsAndBonds
should have been called before
calling this function. If the bond is not in a ring, i.e.
OEBondBase::IsInRing
returns false, then this function also returns
false. This function returns false for all values for size less than
three.