[development] Requiring node revisions

[Robert Douglass]

I'm responding to this before reading the entire rest of the thread, 
but... YES. Diff module is what makes revisions *work*. It is brilliant. 
It is perfect for core.

Derek Wright wrote:
>
> +1 to always requiring revisions (did anyone honestly expect Mr. 
> Revision Control to think otherwise?). ;)
>
> so, next step: diff.module in core?  if we're going to force revisions 
> all the time, shouldn't core have a better UI for displaying them?
>
> -derek
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