corner case bug fixes #678
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window rewriting (cyclic re-substitution)
if a loop is found in the middle, the following nodes will not be removed (take_out_node).
returning true/false in the function object does not affect insert_ntk, so it keeps going, possibly previously already removed nodes in the case where the same node is substituting multiple window outputs.
window construction (reallocation of vector with a referenced element)
level is a reference to an element of levels, while levels may be resized within the loop, that may cause reallocation, invalidating the reference to the element.