Implements a colored background if bind fails to load the zone due to errors
Implements a status text if errors occured
Implements not removing a zone if errors occur. instead old zone stays loaded

Fixed cron to update serial and not sign directly. This now issues a job for the cron server which will then generate the zone and sign it.
cleaner solution AND fixes a possible replication (zone-transfer) issue.

Fixed Open Issue #3789 php-fpm reload workaround targeted at Ubuntu 14.04 breaks newer/fixed PHP packages on Ubuntu 14.04

- Fixed mysql privilege reduction

In addition to /conf-custom/mail/welcome_email_DOMAINNAME.txt and /conf-custom/mail/welcome_email_LANGUAGE.txt one may place a /conf-custom/mail/welcome_email_DOMAINNAME.html or /conf-custom/mail/welcome_email_LANGUAGE.html file to allow HTML based welcome messages.