* Improved handling of SP/TB/OH reording in SMILES/SMARTS.
- add a getMaxNbors(tag) utility function to avoid repeated logic in multiple places
- tweak getChiralPermutation() for handling implicit/missing ligands (uses -1), allow inverse lookup
- use the tweaked chiral ordering in the reading/writing from SMILES
* clang-format run
* Reviewer requested changes.
- curly braces on all if conditions
- null check raw pointers with precondition.
* Correct additional test case introduced in the last year
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