Updates for latest janus

Added janus_flatten_gallery, changed janus_search to work on janus_flat_gallery's, janus_enroll no longer writes to file on disk.
@jklontz @sklum Implementation of latest janus changes.
Per [OpenBR style](https://github.com/biometrics/openbr/wiki/Coding-Style), function opening braces should begin on a new line.