Fix atom highlighting in notebook PNGs (#3000)
Fix atom highlighting in notebook PNGs (#3000)

Also allows bond highlighting in notebook SVGs
greglandrum/rdkit,ptosco/rdkit,ptosco/rdkit,ptosco/rdkit,rdkit/rdkit,bp-kelley/rdkit,rdkit/rdkit,bp-kelley/rdkit,rdkit/rdkit,bp-kelley/rdkit,bp-kelley/rdkit,rdkit/rdkit,bp-kelley/rdkit,bp-kelley/rdkit,ptosco/rdkit,ptosco/rdkit,bp-kelley/rdkit,greglandrum/rdkit,greglandrum/rdkit,rdkit/rdkit,rdkit/rdkit,bp-kelley/rdkit,greglandrum/rdkit,greglandrum/rdkit,rdkit/rdkit,ptosco/rdkit,rdkit/rdkit,greglandrum/rdkit,greglandrum/rdkit,ptosco/rdkit,ptosco/rdkit,greglandrum/rdkit