scoring: propagate SEQRES info from scorer objects to chain mapper

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/pymod/scoring.py

modules/mol/alg/tests/test_ligand_scoring.py

modules/mol/alg/tests/test_scoring.py