You can clone with
HTTPS or Subversion.
In the SEO ranking widget I used to enter another site url and get the corresponding ranking values.
Sinces 1.6 update it doesn't work any more:
The SEO widget is still working for me if I use an URL starting with http(s)://
But we should fix it to work without it aswell.
At the same time, remove Yahoo backlinks /indexed pages. Yet another Yahoo feature that got the axe.
(In ) fixes #2869 removed yahoo backlink and indexed pages check; checking urls without http:// is now possible