Fix the rectangle shape.

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

This one just generated confusion.
Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
Fix the line shape.

Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
JUnit test for square structuring elements.

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