* make sure we don't try to access an SG which no longer exists
* Fixes#6479
updates a bunch of tests to support this
* test ring stereo too
* update expected results from the tests
* add function to canonicalize enhanced stereo representations
* use enhanced stereo in canonicalization
* Fixes#6045
enables the doc tests for EnumerateStereoisomers.py
Re-enables the BRICS tests
* some things work... tests need to be updated
* c++ and python tests pass
* update expected psql results
* run the canonicalization on SMILES generation;
c++ and python tests pass
* cartridge and java tests pass
* update doctests