[MERGE] Add ls-shelf command

[John Arbash Meinel]

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Martin Pool wrote:
> Martin Pool has voted tweak.
> Status is now: Conditionally approved
> Comment:
> I think 'shelve --list/-l' would be a bit more stylish, and avoid
> growing the command list too much.  (I realize it's a grey area, since
> we don't do 'shelve --unshelve'.)

We do have "tag --delete", and we are discussing at least whether we
should have "branch --delete".

I'm probably in favor of "bzr shelve --list" as well, though not
tremendously.

If we stick with "ls-shelf" I would tend to have an alias to
"list-shelf" as well. Probably as the primary name with ls-shelf as the
alias.

John
=:->

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