* backup
* output bond stereoAtoms in debugMol()
* stop removing STEREOCIS/STEREOTRANS markers in setDoubleBondNeighborDirections()
* Re-establish bond dirs in reaction products.
* test all that
(the first set of tests, should do more)
* cleanups
* add SetDoubleBondNeighborDirections() to python API and test it
* add more tests
* changes in response to review
* add another c++ test, fix the java tests
- Module to generate reaction fingerprints: structural FP for screening,
difference FP for similarity search
- Add some utility functions to simplify handling of reactions
- Add new functionality to include agents in the reactions, some adaptions
to parsers and writers had to be done
- Supports intra-bond breaks in products now
- Molecules with rxn role (atom property) can be parse as reaction now
