[MERGE] Nested trees: misc

[Aaron Bentley]

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Ian Clatworthy wrote:
> Ian Clatworthy has voted tweak.
> Status is now: Conditionally approved
> Comment:
> The following lines are redundant IIUIC:
> 
> +import os

Done.

> 
> +        tree._write_inventory(tree.inventory)

This was actually remove earlier after Robert pointed it out.

Aaron
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