Fix canonization of the alphatree and watershed hierarchy
The canonization was not canonizing the nodes at level 0 in the alphatree and watershed hierarchy (#82 (closed)). This problem is solved.
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Fixing the canonization issue #82 (closed) -
Correction of the tests
Futhermore, some minor changes:
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Correct the documentation issue for next
(#85 (closed)) -
Add a propagation option to the component tree attribute function computations