Code style changes.

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

- Explicitely use TrackMate 2.4.1-SNAPSHOT for now
- Use spim-data
Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
Fix some icons.

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