Fixed a sql error in vm list.

- Added: remoting queries with a lot of results (e.g. email addresses or alias domains or dns rr) lead to non-functioning soap requests
  - added '#OFFSET#' AND '#LIMIT#' handling to the query
  - added automatic 'WHERE 1' if an empty array was given as query
  example: $result = $api->sites_web_domain_get('type' => 'vhost', '#OFFSET#' => 25, '#LIMIT#' => 50); to get the websites 26 to 75

- APS Installer: if website has no compatible PHP mode enabled (FastCGI with SuExec or PHP-FPM), change it.

- App Installer: make sure that package URLs get inserted in aps_packages table even when process of updating the packagelist is aborted or reloaded.
- Added an explanation page before package lists are updated.

- Merged language files.

- Extended the tform ISIP check and added the options 'allowempty' and 'separator'

 - included a maximum loop count of 10 on connection errors
 - added check of mysqli ping() result

 - passwords are now enrypted already in tform (and remoting) and not stored in datalog clear text
 - clientdb plugin no longer encrypts password itself but receives crypted password

Fixed:  FS#2066 - Check if problems can occur ins ervices when the default prefix is manually changed
 - Notes:
   once the entry was created or modified after applying this update the current prefix is stored with the entry and kept even if the global prefix changes

- Changed check if a domain is unique so that vhosts with identical domains/hostnames are allowed on different IPs and/or servers.