TrackMate_: semi-automatic tracking for the SpotEditTool

With a nice config panel.
Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
TrackMate_: only accept US-like numbers in text fields

Hopefully fixing - in a different way than Curtis' - Sebastian problem.
Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
MaMuT_: minor cleanup

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