Fix collapseunary #70
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I got a ValueError from applying
treetransforms.collapseunaryon(B (E (C (a 0) (b 1)) (c 2))), ecpecting(B+E (C (a 0) (b 1)) (c 2)):ValueError: Cannot insert a subtree that already has a parent.I found, that this occurs, because the parent reference
Eis not deleted inEs children before they are assigned to the new parentB+E.