subrepo: make it possible to update to hidden subrepo revisions
When a subrepo revision was hidden it was considered missing and mercurial was
unable to update to the corresponding parent revision. Instead warn the user of
the problem and let it choose what to do (the default is to udpate anyway).
hgterm,
am, km, mir, msgr, xenl,
colors#8, cols#80, it#8, lines#24, pairs#64,
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