Merge branch 'pw/rebase-skip-commit-message-fix'

"git rebase -i" with a series of squash/fixup, when one of the
steps stopped in conflicts and ended up getting skipped, did not
handle the accumulated commit log messages, which has been
corrected.

* pw/rebase-skip-commit-message-fix:
  rebase --skip: fix commit message clean up when skipping squash

diff --cc sequencer.c
Simple merge

diff --cc t/test-lib-functions.sh
Simple merge