pass a copy of sceneDict to _makeSceneNxR. fixes #502. #503
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instead of copying some of the keys of sceneDict into a sceneDict2 and passing that to _makeSceneNxR, this updates the appropriate keys, and makes sure that _makeSceneNxR is working from a copy.deepcopy of sceneDict. Because it's a mutable type, this dict was being updated within the makeScene1axis loop. Using a copy here solves that problem.