Revert "remove broken functions from convert module"

Because I forgot that the /render/ page was still using vdom

This reverts commit 93fb944e1f.

www/common/convert.js

@@ -20,13 +20,19 @@ define([
             methods = {
                 dom:{
                     dom: Self,
-                    hjson: hyperjson.fromDOM
+                    hjson: hyperjson.fromDOM,
+                    vdom: function (D) {
+                        return hyperjson.callOn(hyperjson.fromDOM(D), vdom.h);
+                    }
                 },
                 hjson:{
                     hjson: Self,
                     dom: function (H) {
                         // hyperjson.fromDOM,
                         return hyperjson.callOn(H, hyperscript);
+                    },
+                    vdom: function (H) {
+                        return hyperjson.callOn(H, vdom.h);
                     }
                 }
             },