branch: support for shortcuts like @{-1}, completed

branch command with options "edit-description", "set-upstream-to" and
"unset-upstream" expects a branch name.  Since ae5a6c3684 (checkout:
implement "@{-N}" shortcut name for N-th last branch, 2009-01-17) a
branch can be specified using shortcuts like @{-1}.  Those shortcuts
need to be resolved when considering the arguments.

We can modify the description of the previously checked out branch with:

$ git branch --edit--description @{-1}

We can modify the upstream of the previously checked out branch with:

$ git branch --set-upstream-to upstream @{-1}
$ git branch --unset-upstream @{-1}

Signed-off-by: Rubén Justo <rjusto@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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