Fixed Issue 153: z-index of the clones is inverted when you clone several objects at once

git-svn-id: http://svg-edit.googlecode.com/svn/trunk@518 eee81c28-f429-11dd-99c0-75d572ba1ddd

editor/svgcanvas.js

@@ -2900,8 +2900,8 @@ function SvgCanvas(c)
 	this.cloneSelectedElements = function() {
 		var batchCmd = new BatchCommand("Clone Elements");
 		var copiedElements = [];
-		var len = selectedElements.length;
-		for (var i = 0; i < len; ++i) {
+		var i = selectedElements.length;
+		while(i--) {
 			var elem = selectedElements[i];
 			if (elem == null) break;
 			copiedElements.push(elem.cloneNode(true));