The GUI annotation panel is properly resizable.

Only tested on MacOSX yet.
Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
Code style changes.

Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
The MaMuT control panel is resizable.

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