bug#19543: 24.4; vc-mode: 'Fileset is up-to-date' even when vc-diff showed differences

[Ed Avis]

Another way to make it consistent would be for vc-diff to work based on what is 
currently in the buffer, not what's on disk.

But I think a better way to solve it would be for vc-next-action to include a 
quick check of the file's status on disk.  So before it confidently says 
"Fileset is up-to-date", it can go and test if the file has changed, and if so 
go into the usual Emacs prompts about whether to reload the buffer from disk.

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