fixed small bug in mail-backup-cron

- cleaned up some javascript

Completly same functionality as VHost-Subdomain, not to disable if already existing vhostalias-somains in system.

  New global option to grant reseller users access to the options (advanced) tab in web domains and vhost subdomains

Fixed: password match function blocked tabs incorrectly
Fixed: set focus on username input field threw an error if this field did not exist on a page

- Formatted error messages for better visibility.