refactor: makes TrackNode and IdentityNode subclasses of namedtuple
fix: missing imports
fix: Scores.rank() and Scores.nbest() in case of NaN
fix: MultimodalProbabilityGraph.add_track_constraints()
refactor: objective and constraints mixins
feat: implements --nbest option
fix: bug in WeightedInOutObjectiveMixi
Merge branch 'feature/mpg_refactor' of github.com:hbredin/pyannote into feature/mpg_refactor
fix: TrackCooccurrenceGraph no longer relies on get_track_by_name()
refactor: WeightedInOutObjectiveMixin.set_objective() parameters
feat: option to only add edges between speech turns in the future
fix: draw_mpg with new API
fix: Timeline.segmentation() for empty timeline
Merge branch 'feature/mpg_refactor' into develop