Additional modifications to domain/user/Maildir email file structure

- Added email settings' option to specify Maildir directory (depending
  on postfix version this is ./Maildir/, .maildir/ or, optionally, one
  can choose to leave Maildir file structure directly on user's
  directory.
- Fixed database 'insert' command to describe the new structure using
  specified Maildir directory into new accounts.
- Fixed maildirExists function to the new file structure
- Fixed older bug that email exclusions that were scheduled (task 7)
  were not being displayed on overview.
- Added entries on 'english' language file for the new entries on panel
- Changed task id 6 (delete customer) behavior on scrips/jobs/cron_tasks.php
  to assure email account is owned to mail uid/gid and the target is an
  actual directory before zapping it.
- Fixed task id 7 (delete customer mail data) behavior on script above
  to correctly fill and find Maildir and also do additional paranoid
  checks before zapping the mail account directory. Notice this is not
  the same from above directory-wise: here we erase a single account's
  data, while in task id a entire customer set of accounts and domains
  are eliminated.

lib/functions/froxlor/function.CronjobFunctions.php

@@ -209,6 +209,10 @@ function getOutstandingTasks()
 			$task_desc = $lng['tasks']['deleting_customerfiles'];
 			$task_desc = str_replace('%loginname%', $loginname, $task_desc);
 		}
+		elseif($row['type'] == '7')
+		{
+			$task_desc = $lng['tasks']['remove_emailacc_files'];
+		}
 		/*
 		 * Set FS - quota
 		 */