FreeNAS Code

Modify for XHTML validation.
(system menu and help menu)

Code review and improvements.

Do not allow to upload an invalid configuration file.

Hardening WebGUI to prevent cross-site request forgery attacks (JPCERT/CC JVN#15267895).

Make sure it is not possible to execute anything if session has been timed out. Because of that 'auth.inc' MUST be included at FIRST in EACH php script.

Add get_filesize function to fix PHP problem with files > 2GB.

Fix rendering problem.

Enable backup of configuration with Internet Explorer when using HTTPS. Thanks to Andrea Cantini. See https://sourceforge.net/forum/forum.php?thread_id=2096798&forum_id=507590

- Remove CSS style from tabs HTML code
- Mass copyright update

Modify WebGUI look.