Merge branch 'sa/replay-atomic-ref-updates'

"git replay" (experimental) learned to perform ref updates itself in a transaction by default, instead of emitting where each refs should point at and leaving the actual update to another command. * sa/replay-atomic-ref-updates: replay: add replay.refAction config option replay: make atomic ref updates the default behavior replay: use die_for_incompatible_opt2() for option validation