* mln/morpho/tree/compute_attribute_image.hh: Modify code to
	make it work with new tree implementation.
	* mln/morpho/tree/data.hh: Fix bug in preorder iterator (last
	element was ignored).
	* sandbox/edwin/tree/propagate_node.hh,
	* sandbox/edwin/tree/propagation.cc:  Optimize propagation for
	new component tree implementation.
	* tests/morpho/tree/data.cc: Add some tests.

git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@3537 4aad255d-cdde-0310-9447-f3009e2ae8c0