New csf v2.18

New features and bugs fixed:

• Fixed an issue with checking the /var/tmp symlink by comparing the inodes of /tmp and the symlink destination of /var/tmp
• Added checking of /usr/tmp
• Added checking of SSH PasswordAuthentication
• Modified update routine to take a copy of csf.conf before upgrading – the backup file is /etc/csf/csf.conf.preupdate
• Added check in /etc/cron.daily/logrotate for /tmp noexec workaround