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node->swap_tree
node ->swap_tree: node
Swap the subtrees formed by both nodes. It performs the following steps:

  1. Identify common parents and swap the positions in the parent node<-sons chain.
  2. Swaps the node<-parents chain between both nodes
  3. Destroy and recreate the necessary connections. Diagnostics: Fails silently if:
  4. The nodes are not in the same tree or not in a tree at all
  5. One node is a parent of the other @see node->swap
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