Comment search with fast load times

Now, I use ajax calls of similar comments and dynamic creation of context bubbles to make the view_chunks page load as quickly as before.

A note about view_all_chunks:
View_all_chunks has been disabled from caesar.eecs.mit.edu. It has not been disabled from my branch of Caesar; however, writing comments on this page does not work.  My code does not touch this page so this was a problem from before.