New command to assert uniqueness of successor and display it
This will be useful for rebase and fold operations from the Rails app. As explained in the docstring, the same result can be obtained with two successive calls to hg log, together with parsing of results to refuse ambiguities. While such a upstream Mercurial or Evolve should provide a template for this, we'll have a much better robustness with this fully tested command. Making the call from Rails the simplest possible has the biggest value for us.
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