lib-storage: mail_get_headers_utf8() now replaces NULs with spaces. Perhaps there should also be another API function which actually allows returning strings with NULs in them.
lib-storage: mail_get_headers_utf8() now replaces NULs with spaces.
Perhaps there should also be another API function which actually allows
returning strings with NULs in them.

jwm/dovecot-notmuch,jwm/dovecot-notmuch,jwm/dovecot-notmuch,jwm/dovecot-notmuch,jwm/dovecot-notmuch