Fixed #4425 Variable is initialized as string but later written to as array, throws fatal error in PHP 7.1

Fixed #4444 Error in the template htm /usr/local/ispconfig/interface/web/client/templates/reseller_edit_limits.htm

Fixed #4443 Error in the template htm /usr/local/ispconfig/interface/web/client/templates/client_edit_limits.htm

Fixed #4440 Error in the template htm /usr/local/ispconfig/interface/web/client/templates/client_template_edit_limits.htm

fixed issue with missing bracket

I just realised that in my last patch a bracket was missing.
Sorry for that - here's the fix for it.

See merge request !512

small typo in french translation



See merge request !511

Improved the code that generates the ssh keys for clients and shell users and reorganized it into a central function.

minor updates to postfix' amvis-service



See merge request !510

Disable SSL cert check in ISPConfig mail user import tool to allow connections to ISPConfig servers with self-signed SSL certificates.

add suport for Red Hat Software Collections and named-chroot

These patches will add suport for newer Apache webserver from Red Hat Software collections as well as support for running bind in chroot environments.

See merge request !509