prune: skip already obsolete commits
This makes `hg prune` skip already obsolete commits and just print a message about them, just like how `hg rebase` does. --HG-- branch : stable
This instance will be upgraded to Heptapod 0.21.0 (final) on 2021-04-23 at 10:30 UTC+2 (a few minutes of down time)
This makes `hg prune` skip already obsolete commits and just print a message about them, just like how `hg rebase` does. --HG-- branch : stable