Merge branch 'ds/merge-base-independent'

The code to implement "git merge-base --independent" was poorly
done and was kept from the very beginning of the feature.

* ds/merge-base-independent:
  commit-reach: stale commits may prune generation further
  commit-reach: use heuristic in remove_redundant()
  commit-reach: move compare_commits_by_gen
  commit-reach: use one walk in remove_redundant()
  commit-reach: reduce requirements for remove_redundant()