Merge branch 'jn/maint-sequencer-fixes' into maint

* jn/maint-sequencer-fixes: revert: stop creating and removing sequencer-old directory Revert "reset: Make reset remove the sequencer state" revert: do not remove state until sequence is finished revert: allow single-pick in the middle of cherry-pick sequence revert: pass around rev-list args in already-parsed form revert: allow cherry-pick --continue to commit before resuming revert: give --continue handling its own function