Reinstate Ratings

[rgrp]

Ratings were disabled approximately a year ago because:

• Unclear purpose and UX. What did ratings tell you? How useful were they?
• Spamming (esp by bots: you could submit an anonymous rating via a GET request which caused problems)

Both problems are solvable and it would be nice to have this feature reinstated.

• Purpose: can make this more purposable by limiting to logged in users (or at least distinguishing logged in from non-logged in users)
  • Even better we could allow ratings to be made public (I'm interested in what someone else I respect finds important)
• Spamming: limit to logged in users and / or use AJAX over an API to submit ...

[rgrp]

Moving out of v1.6 as many more important things to do.