Added dns_zone_get_id function get id from domain name. To discover a domain id passing domain name as argument.

  @param  -> session_id
  @return -> Array of all Client IDs on server

- Added a function to the remote api to get all virtual machines of a client.

Changed onClick function in DNS resync temlate.

Added a example file for adding a VM with the remote API

http://bugtracker.ispconfig.org/index.php?do=details&task_id=1601&project=3

Thanks Ben Lake

*) Forgot to add the entries for mailman in the main.cf of postfix

Fixed: FS#1220 - /var/vmail/(domain)/(user) directories and files not delete when mail_user is deleted via remote.

Added a function to retrieve the client_id for a given sysuser_id to the remotting API: client_get_id($session_id,$sys_userid);

- Added missing remoting functions