When calling clone(), _data_packet always point to the root of a packet...
When calling clone(), _data_packet always point to the root of a packet cloning chain/tree instead of the packet on which clone() is called. This allows to kill and effectively free intermediate cloned packets in the chain as described in http://librelist.com/browser//click/2014/11/24/clones-of-clones/ . I use a "while" instead of a "if" to go up to the root and not just the parent _data_packet, if a chain still exists. Normally, if people always use clone() that should not happen, but I'm not sure that all elements do not rely on the possibility of making "chains".
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