add database-size monitoring. the results stored in the database may be used to add the db-size to the web-quota, too.

Conflicts:
	interface/lib/classes/validate_dkim.inc.php
	interface/web/dns/dns_dkim_edit.php
	interface/web/dns/dns_dkim_get.php
	interface/web/dns/dns_wizard.php
	interface/web/dns/form/dns_dkim.tform.php
	interface/web/dns/lib/lang/en_dns_dkim.lng
	interface/web/dns/templates/dns_dkim_edit.htm
	interface/web/js/dns_dkim.js
	interface/web/js/mail_domain_dkim.js
	interface/web/mail/mail_domain_dkim_create.php

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

Conflicts:
	install/lib/update.lib.php
	install/sql/incremental/upd_0058.sql
	install/tpl/server.ini.master
	interface/lib/classes/remoting_lib.inc.php
	interface/lib/classes/tform.inc.php
	interface/web/admin/form/server_config.tform.php
	interface/web/mail/templates/mail_domain_edit.htm
	server/cron_daily.php
	server/lib/classes/monitor_tools.inc.php
	server/mods-available/monitor_core_module.inc.php
	server/plugins-available/mail_plugin_dkim.inc.php

 - 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

- Added: First version of client api access with client user credentials
- Changed: 
  - merged remoting_lib and tform into one new base file where appropriate
  - moved some methods into helper methods
  only those methods remain in remoting_lib or tform that are completely
  different in these files or are only used in one of them
- Changed: added check of _GET array in json api handler

  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.

- Implemented: FS#3110 - Turn monitoring module into cron jobs