add amavis-configfile-location for centos 6.4; add amavis-initscrip-name for centos 6.4; fixed missing private_key in mail/mail_domain_dkim_create.php

Changed query syntax of alias domain edit file
Changed deprecated syntax in alpha plesk importer

- nginx: added {DOCROOT} and {FASTCGIPASS} placeholders to directive snippets and nginx Directives fields.

display dns-record for dkim in the mail-domain
rewrite function domain_dkim_update in server/plugins-available/mail_plugin_dkim.inc.php
change dns*.php according to commit 604c0c24

- Display server name in all web domains select fields so that you know which domain from which server you select.

skip writing dkim-values for inactive domains
removed the public-dkim-key from the interface
added german language-file

- Websites and Vhostsubdomains: When editing a web, show quota and traffic errors to client/reseller only if he has changed those values; don't show errors for unchanged values.

 - javascript hooks prepared (onAfterContentLoad is first available hook)
 - new abstract class for GET and POST requests
 - new js.d directory that is included into main template

  http://yourispconfig:8080/remote/json.php?sites_web_domain_get
  with POST data:
  session=12345678901234567890123456789012&data=%7B%22type%22%3A%22vhost%22%2C%22active%22%3A%22y%22%2C%22php%22%3A%22fast-cgi%22%2C%22fastcgi_php_version%22%3A%22%22%2C%22%23LIMIT%23%22%3A1%7D
  where data is an urlencoded json-object of the params array used in SOAP api.

- Added dkim installation to installer.
- Added backup filesize in backup cronjob.