Binding linear scoring

bob/learn/misc/__plda_trainer__.py

bob/learn/misc/include/bob.learn.misc/PLDATrainer.h

bob/learn/misc/kmeans_trainer.cpp

bob/learn/misc/linear_scoring.cpp

bob/learn/misc/main.cpp

bob/learn/misc/main.h

bob/learn/misc/plda_machine.cpp

bob/learn/misc/plda_trainer.cpp

bob/learn/misc/test_plda_trainer.py

bob/learn/misc/ztnorm.cpp

setup.py