rdkit/rdkit: 2021_09_3 (Q3 2021) Release

Release_2021.09.3 (Changes relative to Release_2021.09.2) Acknowledgements Jacob Gora, Gareth Jones, Brian Kelley, Ricardo Rodriguez-Schmidt, Paolo Tosco, Kazuya Ujihara, Riccardo Vianello Bug Fixes: handle sqlalchemy deprecation (github #4625 from greglandrum) fix parsing beyond the end of the input string in findMCSsmiles (github #4636 from rvianello) Mem leak fixes (github #4637 from ricrogz) Subsequent call to rdChemReactions.ChemicalReaction.RunReactants will block indefinitely. (github #4651 from goraj) Fix docstring of ConstrainedEmbed (github #4666 from kazuyaujihara) [Operational] get windows CI builds working again (github #4672 from greglandrum) Molfile SDD records not properly displayed (github #4690 from jones-gareth) RGD: fix for cores with MOL block atom lists (github #4695 from jones-gareth) RGD align output core to input structure (github #4709 from jones-gareth) TorsionFingerprints raises error with S(Cl)F4 group (github #4720 from kazuyaujihara) TautomerEnumerator will crash if copied with a callback set (github #4736 from ptosco) Update mac CI builds (github #4738 from greglandrum) Minor PandasTools cleanup (github #4744 from ptosco) Reaction parser fails when CX extensions are present (github #4759 from greglandrum) Fixes crashing bug with finalSubstructChecks (github #4782 from greglandrum) [Cartridge]: qmol_from_ctab and qmol_from_smiles are sanitizing molecules (github #4787 from greglandrum