Try to make Jeff happy

Make use of a nonce for setting SVG-Edit IDs
option. By default, SVG-Edit behaves as before.
Calling svgCanvas.randomizeIds(true) gives our
behaviour, instead.

Also, sync with latest SVG-Edit (but disable,
for now, manual editing of IDs).

public/javascripts/page_helper.js

@@ -91,6 +91,7 @@ function setupSVGedit(path){
                   window.close();
                   }
           });
+          editor.svgCanvas.randomizeIds();
           editor.svgCanvas.setSvgString(selected);
         }, true);
       } else {
@@ -101,6 +102,7 @@ function setupSVGedit(path){
                   window.close();
                   }
           });
+          editor.svgCanvas.randomizeIds();
         }, true);      
       }
       SVGeditButton.disabled = true;