finished multiclass case

Code/MonoMultiViewClassifiers/ExecClassif.py

...ewClassifiers/MultiviewClassifiers/Fusion/FusionModule.py

...ViewClassifiers/MultiviewClassifiers/Mumbo/MumboModule.py

Code/MonoMultiViewClassifiers/utils/execution.py

Code/Tests/Test_MultiviewClassifiers/Test_Fusion/__init__.py

...est_MultiviewClassifiers/Test_Fusion/test_FusionModule.py

Code/Tests/Test_MultiviewClassifiers/Test_Mumbo/__init__.py

.../Test_MultiviewClassifiers/Test_Mumbo/test_MumboModule.py

Code/Tests/Test_MultiviewClassifiers/__init__.py

Code/Tests/test_ExecClassif.py