Simplify test organization

MANIFEST.in

xbob/measure/data/dev-4col.txt

xbob/measure/data/dev-5col.txt

xbob/measure/data/linsep-negatives.hdf5

xbob/measure/data/linsep-positives.hdf5

xbob/measure/data/make-examples.py

xbob/measure/data/nonsep-det.hdf5

xbob/measure/data/nonsep-epc.hdf5

xbob/measure/data/nonsep-negatives.hdf5

xbob/measure/data/nonsep-positives.hdf5

xbob/measure/data/nonsep-precisionrecall.hdf5

xbob/measure/data/nonsep-roc.hdf5

xbob/measure/data/scores-cmc-4col.txt

xbob/measure/data/scores-cmc-5col.txt

xbob/measure/data/test-4col.txt

xbob/measure/data/test-5col.txt

xbob/measure/test/__init__.py

xbob/measure/test_error.py

xbob/measure/test_scripts.py