Bonds in allyl cation are not conjugated

[greglandrum]

Reported by Paolo Tosco

In [2]: m = Chem.MolFromSmiles('C=C-[CH2+]')

In [3]: for b in m.GetBonds():
    print(b.GetIsConjugated())
   ...:     
False
False

In [4]: for a in m.GetAtoms():
    print(a.GetHybridization())
   ...:     
SP2
SP2
SP2

[ptosco]

I noticed that also aromatic carbocations such as cyclopropenyl and tropylium are not perceived as aromatic, nor can be kekulized. I have submitted a pull request #540 which should fix all of these.

[greglandrum]

Fixed by #540