QS score implementation which is tightly integrated with chain mapping

modules/mol/alg/doc/molalg.rst

modules/mol/alg/doc/qsscoring_deprecated.rst

modules/mol/alg/pymod/CMakeLists.txt

modules/mol/alg/pymod/chain_mapping.py

modules/mol/alg/pymod/qsscore.py

modules/mol/alg/tests/CMakeLists.txt

modules/mol/alg/tests/test_qsscore.py