Add some utility methods to Morphology.

Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
Move the single shape dilation operation to a specific class and add some.

Imglibification through new method signatures. There are now methods
that takes source and target.
Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>