add OpenLayers.Console namespace and a number of methods that allow for logging of error messages - when firebug.js is included in a page, the application runs in "debug" mode - the Firebug extension or Firebug Lite handles OpenLayers.Console calls depending on availability

git-svn-id: http://svn.openlayers.org/trunk/openlayers@3320 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/Firebug/firebugx.js

@@ -0,0 +1,10 @@
+
+if (!window.console || !console.firebug)
+{
+    var names = ["log", "debug", "info", "warn", "error", "assert", "dir", "dirxml",
+    "group", "groupEnd", "time", "timeEnd", "count", "trace", "profile", "profileEnd"];
+
+    window.console = {};
+    for (var i = 0; i < names.length; ++i)
+        window.console[names[i]] = function() {}
+}