Cleaning up the C++ code

bob/learn/linear/__init__.py

bob/learn/linear/auxiliary.py

bob/learn/linear/bic.cpp

bob/learn/linear/cpp/bic.cpp

bob/learn/linear/cpp/lda.cpp

bob/learn/linear/cpp/logreg.cpp

bob/learn/linear/cpp/machine.cpp

bob/learn/linear/cpp/pca.cpp

bob/learn/linear/data/dslr.mat

bob/learn/linear/data/dslr.mat.hdf5

bob/learn/linear/data/dslr_labels.mat

bob/learn/linear/data/dslr_labels.mat.hdf5

bob/learn/linear/data/linear-test.hdf5

bob/learn/linear/data/negatives_isv.hdf5

bob/learn/linear/data/negatives_lda.hdf5

bob/learn/linear/data/positives_isv.hdf5

bob/learn/linear/data/positives_lda.hdf5

bob/learn/linear/data/webcam.mat

bob/learn/linear/data/webcam.mat.hdf5

bob/learn/linear/data/webcam_labels.mat