Disable Sphinx nitpicky and disable Python 2

See merge request bob/bob.db.fargo!2

[script] added code to write dummy eyes position in case a face is not detected, otherwise verifiy.py complains ...

[script] enhanced face detection script, providing the choice of eyes localization: bob, dlib or mtcnn

[test] fixed the way the db is imported (removing the dependencies to entry points), remove header in query