FS#1212 - IP Address in fetchmail - allow ipv4 or hostname for pop/imap-server

See merge request !196

Master

See merge request !195

Master

See merge request !194

postfix plugins should not corrupt "other" settings + fix

postfix plugins should not corrupt "other" settings - sysadmin, ...
fixes some misconfiguration under certain circonstances

See merge request !191

fixes also some misconfiguration under some circonstances

add missing global $app

See merge request !190

Define MySQL port by its own (rather than in the host with :port)

As the title says, this MR allows defining the MySQL server port in a new variable.

After having done the work I saw that it can simply be passed with the hostname, like `hostname:port`....
so I'm not going to be sad if this MR is getting closed asap. *rofl*

Leaving it here anyway.

See merge request !187

Ensure the internal PHP scripts work even if system-wide PHP settings are set

Another solution would be to reference the `php.ini` in `./server/lib` from all scripts...but maybe that's a bit of an overkill.

See: http://bugtracker.ispconfig.org/index.php?do=details&task_id=3293&project=3&string=php&type[0]=&sev[0]=&pri[0]=&due[0]=&reported[0]=&cat[0]=&status[0]=open&percent[0]=&opened=&dev=&closed=&duedatefrom=&duedateto=&changedfrom=&changedto=&openedfrom=&openedto=&closedfrom=&closedto=&pagenum=2

See merge request !188

ProxyPassMatch is only possible if running PHP-FPM over TCP

This fixes an error when `mod_proxy_fcgi` is installed/enabled but PHP-FPM is listening on a socket.

See merge request !189

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