tests/test-gendoc-ro.t

localrepo: avoid unnecessary conversion from node to rev

changelog.heads() first calls headrevs then converts them to nodes.
localrepo.heads() then sorts them using self.changelog.rev function and makes
useless conversion back to revs. Instead let's call changelog.headrevs() from
localrepo.heads(), sort the output and then convert to nodes. Because headrevs
does not support start parameter this optimization only works if start is None.

#require docutils gettext

  $ $TESTDIR/check-gendoc ro
  checking for parse errors