Colour non carbon atoms also should be a feature for a given user defined colour

[FilomenoSanchez]

When calling:

    molecules_container.set_user_defined_bond_colours(imol, colourMap)
    molecules_container.set_user_defined_atom_colour_by_selection(imol, indexedResiduesVec, nonCarbonAtoms)

We need a way to specify whether non carbons should also be coloured at the "user defined colour" level, so either within the colourMap or the indexedResiduesVec. This is required for Goodsell colours.