Added MLMMJ installer

I've tryed to implement the installer for mlmmj
This is my first experience on merging with an external project. I hope all my work is correct. 
Anyway, I'm here and responsive to your comments
After that, I'm working, by now on the ML web interface. 
I'll do another merge request when it will be ready.

See merge request !432

Stable 3.1



See merge request !429

clean up servers select list when adding firewall record (Fixes: #4088)



See merge request !428

Stable 3.1



See merge request !427

fixed 300-quota_notify.inc.php



See merge request !426

Remote API: new API call: server_get_php_versions.

This function was missing in a multi ISPC server environment, so I've implemented it. It has been tested and is working with both SOAP and REST calls. The result is an array of values that are accepted in the websites 'fastcgi_php_version' parameter.

See merge request !425

Update bind_plugin.inc.php

to correct "PHP Parse error:  syntax error, unexpected ':' in /usr/local/ispconfig/server/plugins-available/bind_plugin.inc.php on line 279"

See merge request !424

Update bind_plugin.inc.php to correct "PHP Parse error:  syntax error, unexpected ':' in /usr/local/ispconfig/server/plugins-available/bind_plugin.inc.php on line 279"

Stable 3.1



See merge request !423

Stable 3.1



See merge request !422

Hide Databases menu if no db-server is defined #4128



See merge request !421