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* Set _SmilesStart when parsing SMARTS. * SmartsWriter should also invert first atoms, like SMILES. * Update test cases now these SMILES match themselves as SMARTS. * rerun bison * cleanup a possible repeated define * When an atom moves from the first to second position winding should flip in SMARTS (i.e. same as SMILES). --------- Co-authored-by: greg landrum <greg.landrum@gmail.com>