Fixes for Kusaba X URL Upload

[----- Fixes for Kusaba X URL Upload -----]

-This was a paste detailing a bug with Jmyeom's URL upload mod (http://pastebin.com/BL2fcf9M) and newer versions of Kusaba X I'm re-uploading on request, I think the fix is tested on a few sites and works okay.-

Originally I was making a fix for the mod insisting it has a message with an image uploaded from URL, the fix for that:
In board.php,

	if ($post_isreply) {
		if ($imagefile_name == '' && !$is_oekaki && $post_message == '') {
			exitWithErrorPage(_gettext('An image, or message, is required for a reply.'));

Becomes:

	if ($post_isreply) {
		if ($imagefile_name == '' && !$is_oekaki && $post_message == '' && empty($_POST['fileurl'])) {
			exitWithErrorPage(_gettext('An image, or message, is required for a reply.'));

While playing about with that I noticed I was able to post with no file or message, threads and replies, wether or not my new fix was included.
The "A file is required for a new thread. If embedding is allowed, either a file or embed ID is required." error wasn't chucking right, either was the relevant error in threads.
My fix for that:
In board.php,

		if ($imagefile_name == '' && !$is_oekaki && ((!isset($_POST['nofile'])&&$board_class->board['enablenofile']==1) || $board_class->board['enablenofile']==0) && ($board_class->board['type'] == 0 || $board_class->board['type'] == 2 || $board_class->board['type'] == 3) && !isset($_POST['fileurl']) && !empty($_POST['fileurl'])) {
                        if (!isset($_POST['embed']) && $board_class->board['uploadtype'] != 1) {
                                exitWithErrorPage(_gettext('A file is required for a new thread. If embedding is allowed, either a file or embed ID is required.'));
                        }

Must have

 && !isset($_POST['fileurl'])

Removed to make it

		if ($imagefile_name == '' && !$is_oekaki && ((!isset($_POST['nofile'])&&$board_class->board['enablenofile']==1) || $board_class->board['enablenofile']==0) && ($board_class->board['type'] == 0 || $board_class->board['type'] == 2 || $board_class->board['type'] == 3) && empty($_POST['fileurl']) ) {
                        if (!isset($_POST['embed']) && $board_class->board['uploadtype'] != 1) {
                                exitWithErrorPage(_gettext('A file is required for a new thread. If embedding is allowed, either a file or embed ID is required.'));
                        }

My initial fix was removing

 && !isset($_POST['fileurl']) && !empty($_POST['fileurl'])

Though that prevented new threads with a URL image, so i returned

!empty($_POST['fileurl'])

And that seems to be it.