- Update Opera and jQuery links

- Use `https://` (fix #172), including in prompt for URL and relevant code comments (where available and naturally not on namespaces)
- Comment out broken link in svg-editor.html
- Trailing space

editor/jquery-svg.js

@@ -16,7 +16,7 @@
 // This fixes $(...).attr() to work as expected with SVG elements.
 // Does not currently use *AttributeNS() since we rarely need that.
 
-// See http://api.jquery.com/attr/ for basic documentation of .attr()
+// See https://api.jquery.com/attr/ for basic documentation of .attr()
 
 // Additional functionality:
 // - When getting attributes, a string that's a number is return as type number.