[MERGE][0.15] Hide commands for nested trees.

[Aaron Bentley]

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Aaron Bentley wrote:
> So I propose we introduce a new commandline format: "branch6" (or
> "tags"), which is WT4 + Branch6 + KnitRepo1.  We turn
> "dirstate-with-subtrees" into an experimental format for this iteration.
> 
> This kills two birds with one stone, because people can use tags without
> a watershed, and people won't use subtrees by accident.

Here is a patch that will do what I've proposed, if we decide to go
forward with it.

Aaron
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