Updated doctest and fixed some parsing errors

bob/learn/em/MAP_gmm_trainer.cpp

bob/learn/em/ML_gmm_trainer.cpp

bob/learn/em/__ivector_trainer__.py

bob/learn/em/empca_trainer.cpp

bob/learn/em/gaussian.cpp

bob/learn/em/gmm_machine.cpp

bob/learn/em/gmm_stats.cpp

bob/learn/em/isv_base.cpp

bob/learn/em/isv_machine.cpp

bob/learn/em/isv_trainer.cpp

bob/learn/em/ivector_machine.cpp

bob/learn/em/ivector_trainer.cpp

bob/learn/em/jfa_base.cpp

bob/learn/em/jfa_machine.cpp

bob/learn/em/jfa_trainer.cpp

bob/learn/em/kmeans_machine.cpp

bob/learn/em/kmeans_trainer.cpp

bob/learn/em/linear_scoring.cpp

bob/learn/em/plda_base.cpp

bob/learn/em/plda_machine.cpp