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

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)