MDL-21405 adding global M instance, going to demonstrate how to use it soon, in theory could be reverted if too many ppl protest ;-)

lib/javascript-static.js

@@ -1,6 +1,15 @@
 // Miscellaneous core Javascript functions for Moodle
 // Global instance of YUI3
+
+// Global Y instance, inilialised much later in page footer
 var Y = null;
+
+// Global M object, this helps with solving of namespace and scope issues
+var M = {}
+
+
+// === old legacy JS code, hopefully to be replaced soon by M.xx.yy and YUI3 code ===
+
 function popupchecker(msg) {
     var testwindow = window.open('', '', 'width=1,height=1,left=0,top=0,scrollbars=no');
     if (!testwindow) {