proposes positions for the nodes of a gn object
Following some heuristics computes new positions for a /gn/
(='a') indicates which heuristic must be used. (a) for acp on the arc, (h) adapted for hierarchical trees from roots, (h2) idem but with vertical alternance, (H) adapted for hierarchical trees from leafs, (H2) idem but with vertical a
The same 'gn' object with the new positions
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