[Watchdog] Use stackoverflow.com for DNS check

[Git] Ignore mail_plugins*
[Dovecot] Read mail_plugins from dynamically generated file
[Dovecot] Encrypt FTS
[Dovecot] Add break_imap_seach option to Solr
[Web] Add ability to send quarantine notification mails
[Web] Minor style fixes
[Web] Add new MAILBOX_DEFAULT_ATTRIBUTES (doc updates, anyone? :-( )
[Web] Use rcpt_smtp if rcpt_mime is not set
[Web] Other minor fixes

data/web/js/mailcow.js

@@ -161,7 +161,8 @@ $(document).ready(function() {
       $(document).on("keydown", disableF5);
     }
   });
-
+  // Textarea line numbers
+  $(".textarea-code").numberedtextarea({allowTabChar: true});
   // trigger container restart
   $('#RestartContainer').on('show.bs.modal', function(e) {
     var container = $(e.relatedTarget).data('container');