* In addition to language specific custom welcome messages (when creating a new mail account) this patch will
allow to have a welcome message template for each domain.

* To add a domain specific welcome message, place a file at /usr/local/ispconfig/server/conf-custom/mail/
and name it according the domain, like welcome_email_example.com.txt

* i.e. /usr/local/ispconfig/server/conf-custom/mail/welcome_email_example.com.txt

will be used if a mailbox for example.com is created.

Dominik authored Dec 30, 2015 and Dominik committed Dec 30, 2015

After this, it is possible to use both:
 - sub.domain.tld
 - *.domain.tld
together with different folders by rewrite (with rewrite_type = L for sub.domain.tld)
Before it was not clearified which rule matches first, it always dependet on the creation-time of the subdomain

Conflicts:
	server/plugins-available/apache2_plugin.inc.php

- made placeholders visible for apache, too
- added event raise at formdef loading (on_before_formdef and on_after_formdef)
- added possibility to put plugin files into module/lib/plugin.d/ directory

- fixed letsencrypt domain list

- added cron for letsencrypt renewal

Conflicts:
	interface/lib/classes/remoting.inc.php
	interface/web/mail/templates/mail_user_backup_list.htm
	interface/web/sites/lib/lang/en_web_backup_list.lng
	interface/web/sites/lib/lang/es_web_backup_list.lng
	interface/web/sites/lib/lang/tr_web_backup_list.lng
	server/plugins-available/backup_plugin.inc.php

https://ssltools.websecurity.symantec.com/checker/views/csrCheck.jsp
You have 1 error
Your CSR contains a challenge phrase.
Adding a challenge phrase to a CSR is not a secure practice. Please generate a new CSR that does not contain a challenge phrase.

The problem occure while buying a cert from https://www.ssls.com/
The support reply with:
"Please regenerate it without the passphrase and try to activate the certificate once again."

FS#3830 - Password is not updated in `mysql`.`user` table when read-only database user's password is changed

moved dovecot-lmtpd from install/update to server-plugin to prevented dovecot-errors when using dovecot without dovecot-lmtpd

FS#3526 - Add option to disable BIND zone check (the intention for the feature request was more to hide log-messages and not to disable the named-checkzone-call)

- backported patches