* Fyorl/ticket/10939:
[ticket/10939] Added documentation for phpbb_request::file
[ticket/10939] Added tests for phpbb_request::file
[ticket/10939] Modified the default return for $request->file
[ticket/10939] Modified fileupload tests to deal with new behaviour
[ticket/10939] Modified mock request class to handle deactivated $_FILES
[ticket/10939] Modified acp_groups.php to not use $_FILES
[ticket/10939] Modified ucp_groups.php to not use $_FILES
[ticket/10939] Modified functions_user.php to not use $_FILES
[ticket/10939] Modified message_parser.php to not use $_FILES
[ticket/10939] Modified functions_upload to not use $_FILES
[ticket/10939] Modified request test slightly to include $_FILES
[ticket/10939] Added $_FILES handling to phpbb_request