Explain changes between requests

[g105b]

The current implementation shows a list of responses associated to the current request, which only really makes sense if none of the parameters change on the request between responses.

If I create a request, execute it so I can see the response, and then change something like the query strings or method, what should happen to the existing responses? They could be deleted, but I think it would be better to keep them, but show what's changed.

This can be done using bindListCallback() here instead of bindList(). The ResponseEntity will need to take a reference of the RequestEntity in the constructor (like it used to), and then for each iteration it can check what's difference, and list out the changes to the page.