ligand scoring: integrate refactored ligand scoring

modules/mol/alg/doc/molalg.rst

modules/mol/alg/pymod/CMakeLists.txt

modules/mol/alg/pymod/ligand_scoring.py

modules/mol/alg/pymod/ligand_scoring_base.py

modules/mol/alg/pymod/ligand_scoring_lddtpli.py

modules/mol/alg/pymod/ligand_scoring_scrmsd.py

modules/mol/alg/tests/CMakeLists.txt

modules/mol/alg/tests/test_ligand_scoring.py

modules/mol/alg/tests/test_ligand_scoring_fancy.py