Changed default for "Install ISPConfig Web Interface" to 'n' for multiserver slave installs in extended install mode.

- Fixed "PHP Notice:  Undefined variable: rbl_list in /tmp/ispconfig-3.0.5/install/dist/lib/fedora.lib.php on line 173"
- Redirect Apache/nginx/PHP-FPM/BIND restart errors to STDOUT.

- Added rewrite rule checks to nginx plugin.

  [company_name :: ] contact_name (username[, customer_no])

- Added [SERVERNAME] placeholder to webmail URL.

- Added "Rewrite Rules" field to the "Redirect" tab so that customers can set rewrite rules themselves on nginx.

  Along with this fixed some display problems with the combo boxes introduced in 3.0.5.
  Some fields were not correctly displayed with the predefined values if value and text of the underlying option element differ.

- Display/email reason for service restart/reload failure (if init script doesn't suppress error messages).