Define bash as a parser, some systems can have "dash" as a "sh" that will end with errors.
# /usr/local/ispconfig/server/cron_daily.sh
[: 10: root: unexpected operator
[: 10: root: unexpected operator

ensure the internal PHP scripts work even if system-wide PHP settings are set that could affect how ISPConfig would work. See FS#3293

- Create md5 sums of all files at install and update.

Fixed: FS#1623 - vhost.conf.master placed in /root overrides vhost.conf.master in ispconfig/server/conf