Be more generous in in column width in TrackScheme InfoPane.

Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
Merge branch 'master' of github.com:fiji/TrackMate
Remove unneeded import.

Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
Put back forgotten Manual Tracker.

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