Code style changes.

Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
The display format in JNumericTextField can now be set.

Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
Made the configure view panel resizable.

and still extandable.
Oooh the pain. This is one of the most painful thing I have been doing
for TrackMate.
Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>