#1323 Should hydrogen added overwrite implicit hydrogen counts?

[John May]

Example below shows it would be useful to turn this off. Also perhaps AtomContainerManipulator should have utility to add hydrogens?

IChemObjectBuilder     builder = SilentChemObjectBuilder.getInstance();
SmilesParser           sp      = new SmilesParser(builder);
SmilesGenerator        sg      = new SmilesGenerator();
InChIGeneratorFactory  igf     = InChIGeneratorFactory.getInstance();

IAtomContainer m = sp.parseSmiles("[O]");
System.out.println(sg.create(m));                         // [O]
System.out.println(igf.getInChIGenerator(m).getInchi());  // InChI=1S/O

// configure atom types
AtomContainerManipulator.percieveAtomTypesAndConfigureAtoms(m);
CDKHydrogenAdder.getInstance(builder).addImplicitHydrogens(m);

System.out.println(sg.create(m));                         // O ([OH2])
System.out.println(igf.getInChIGenerator(m).getInchi());  // InChI=1S/H2O/h1H2