[MERGE][Bug #273993] Add --no-tree option to `bzr branch`

[Ian Clatworthy]

Daniel Watkins wrote:
> Hi John,
> 
> Thanks for the speedy review.

Thanks for this. I can imagine quite a few people will find it
useful. John had already voted tweak so I'll go ahead and merge this.

bb:tweak

> +    * ``bzr branch`` now has a ``--no-tree`` option which turns off the
> +      generation of a working tree in the new branch.
> +      (Daniel Watkins, #273993)

You mentioned that the original work was done by John Klinger. I'll add
his name to the NEWS items while merging.

The only other thing that comes to mind is what we do for really old
formats. It looks like we ignore --no-tree for them. Perhaps we ought to
either error or split out a warning to that effect? That can come as a
separate patch, if desirable.

Ian C.