TrackMate_: hide the preview button for the manual annotation panel

Signed-off-by: Jean-Yves Tinevez <jeanyves.tinevez@gmail.com>
TrackMate_: prevent GUI components invalid state

Signed-off-by: Jean-Yves Tinevez <jeanyves.tinevez@gmail.com>
TrackMate_: do not keep memory of totally removed tracks

Signed-off-by: Jean-Yves Tinevez <jeanyves.tinevez@gmail.com>