Remove assignment operator from octree_iterator.
This is a follow-up to gerrit I3e5e8858d31f0711d49e0281adbfbd7c7b6e381e. In that commit, I removed the assignment operator from octree_path because it looked as though the only reason for a custom-defined operator was to work around some const-related bugs in Visual Studio 6. The octree_iterator class is a subclass of octree_path that had exactly the same issues. Change-Id: I15e7622e7c8bde139770e7bf6ff058360f0335fd
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