TrackMate_: fix a bug when adding a single spot to a track

Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
TrackMate_: add a plugin to load a TrackMate file

Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
Merge remote-tracking branch 'origin/track-mate' into multiviewtracker
TrackMate_: an abstract class for semi-automatic tracking

Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
MaMuT_: make the semi-auto tracking implements class in TrackMate

Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>