title: How to determine in Mercurial, if changeset, specified by revision, has already been grafted?
body: <p>How can I see, if the changeset has already been grafted between branchX and default?
  I know, hg graft checks this for me, there I can't graft twice, but I want to list all changesets, which were not grafted between branchX and default.
  Thanks in advance for your answers.</p>