Merge branch 'maint'

* maint: git-send-email.txt: move --format-patch paragraph to a proper location git-shortlog.txt: improve documentation about .mailmap files pretty: support multiline subjects with format: pretty: factor out format_subject() pretty: factor out skip_empty_lines() merge-file: handle freopen() failure daemon: cleanup: factor out xstrdup_tolower() daemon: cleanup: replace loop with if daemon: handle freopen() failure describe: Avoid unnecessary warning when using --all