New handling of scores

bob/fusion/base/algorithm/MLP.py

bob/fusion/base/script/bob_fuse.py

bob/fusion/base/script/plot_fusion_decision_boundary.py

bob/fusion/base/test/test_scripts.py

bob/fusion/base/tools/__init__.py

bob/fusion/base/tools/command_line.py

bob/fusion/base/tools/common.py

bob/fusion/base/tools/plotting.py