utility: convert node from MultipleSuccessorsError to rev numbers (issue5832)
utility.builddependencies() deals with rev numbers but MultipleSuccessorsError
returns nodeid which breaks the function and also breaks instability resolution.
Previou patch demonstrate the breakage. This patch makes sure we convert those
nodeids to rev numbers before processing ahead.
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Evolve Commands Reference
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amend
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.. hghelp:: amend
evolve
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fold
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