Fixing and adding features to the scores generation script

See merge request !198

Removed useless imports

dev, eval and unknown were generating the same scores.

Default to generate the correct number of scores given a number of
subjects and probes per subject.

Added a way to specify a set number of scores.

-p was used for "number of probes" and "sigma positive".
Removed the former.

Negative and Positive score generation used the same constant instead of
the intended two assigned higher.

Resolve "`check_existence` flag incorrectly handled in filelistdatabase query"

Closes #134

See merge request !191

Explain how new databases are configured

See merge request !170

Remove usage of numpy.testing.decorators

Closes #132

See merge request !183

Fixes #132

Add bob bio annotate-samples command

See merge request !176

This command works very similar to bob bio annotate
except that works without a db interface. Instead,
it requires a list of samples and two functions to
do the job.

Separate semilogx and TPR options in ROC plots

See merge request !179

Fixed issue with numpy.ndarray.resize py37

See merge request !178

Adds a sort command and small fixes

See merge request !174

small fix in help message

See merge request !175

Fix the tests after legend loc option change in bob.measure!89

See merge request !172

Implemented multiple subjects score generation, unknown probes and fixed issues

See merge request !171