fixes several bugs regarding database annotations

bob/bio/face/config/database/banca_english.py

bob/bio/face/config/database/caspeal.py

bob/bio/face/config/database/gbu.py

bob/bio/face/config/database/lfw_unrestricted.py

bob/bio/face/config/database/multipie.py

bob/bio/face/database/__init__.py

bob/bio/face/database/arface.py

bob/bio/face/database/atnt.py

bob/bio/face/database/banca.py

bob/bio/face/database/caspeal.py

bob/bio/face/database/cuhk_cufs.py

bob/bio/face/database/frgc.py

bob/bio/face/database/gbu.py

bob/bio/face/database/ijba.py

bob/bio/face/database/lfw.py

bob/bio/face/database/mobio.py

bob/bio/face/database/multipie.py

bob/bio/face/database/replay.py

bob/bio/face/database/replaymobile.py

bob/bio/face/database/scface.py