Beam 0.5. - resolve a bug that would randomly fail when configuring double-bond stereochemistry (found from the new random order of IStereoElement sets). - parse tetrahedral selenium and sulphur cations (okay according to inchi tech manual) - parser arbitrary labels in bracket atoms - they are never generated output but instead placed in the ‘label’ of a pseudo atom if one wants to handle them.

Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>
Arbitrary labels in SMILES bracket atoms. The label is set in the pseudo atom.

Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>