Interop printing function with ETE Toolkit

[PerretB]

It could be interesting to add an interface for drawing trees with ETE Toolkit especially for documentation purpose

[PerretB]

Simple POC for partition hierarchy

def hierarchy_to_ete_tree(tree, altitudes=None, **attributes):
    ete_tree = ete.Tree()

    stack = [(tree.root(), ete_tree)]

    if altitudes is not None:
        altitudes = altitudes[tree.parents()] - altitudes

    while len(stack) != 0:
        node, ete_node = stack.pop()

        [ete_node.name](http://ete_node.name/) = str(node)
        if altitudes is not None:
            ete_node.dist = altitudes[node]
        attr = {name:values[node] for (name,values) in attributes.items()}
        ete_node.add_features(**attr)

        for c in tree.children(node):
            stack.append((c, ete_node.add_child()))

    return ete_tree

tree = hg.Tree((7, 7, 8, 8, 8, 9, 9, 11, 10, 10, 11, 11))
altitudes = hg.attribute_regular_altitudes(tree)
t = hierarchy_to_ete_tree(tree, altitudes)
print(t)
t.render("img.png")
t.show()