Summarizer for the bob_htface_evaluate_and_squash script

Today in the script bob_htface_evaluate_and_squash.py we need to add ALL the score paths (for each fold).

Would be useful to have some sort of score discovery based on a base path.

Possible usage:

bob_htface_evaluate_and_squash.py <baseline1> [<baseline2> ... <baseline_n>], where <baseline_n> is composed by more than one experiment