Patch to address issues described.
- /etc/periodic has special cases for zcat and bzcat, but not for zstd and xz which newsyslog also supports.
- newsyslog.conf manpage does not have a xref for zstd(1).
- usr.sbin/periodic/etc/monthly/200.accounting does not use temporary files appropriately.
- periodic.conf(5) refers to "daily accounting" and "monthly accounting" withouth being clear that "daily" means process accounting and "monthly" is login accounting.