[doc] Use checkout in subdir "bob"

doc/index.rst

doc/plot/convolve.py

doc/plot/detect_faces_mtcnn.py

doc/plot/detect_single_face.py

doc/plot/disparity.py

doc/plot/face_eyes_norm.py

doc/plot/gaussian.py

doc/plot/iris_lda.py

doc/plot/iris_lda_roc.py

doc/plot/plot_ISV.py

doc/plot/plot_JFA.py

doc/plot/plot_MAP.py

doc/plot/plot_ML.py

doc/plot/plot_Tnorm.py

doc/plot/plot_ZTnorm.py

doc/plot/plot_Znorm.py

doc/plot/plot_align_faces.py

doc/plot/plot_iVector.py

doc/plot/plot_kmeans.py

doc/plot/plot_landmarks.py