bug#9959: 24.0.90; `count-words' command from a narrowed buffer

[Drew Adams]

> > If I've narrowed a very large buffer to a small region, I am 
> > not interested in the counts for the entire buffer nor
> > willing to wait for them.
> 
> Yes, that's the cost of such combining.
> 
> Possible solutions include (a) adding separate commands for 
> individual pieces of
> the combination and (b) finding a way (e.g. prefix arg) to 
> specify interactively
> to this command that you want only one or two pieces of info, 
> not everything.

Another possibility: Do as we do with `apropos' commands.  We have both a prefix
arg and a user option, `apropos-do-all', that affect the behavior, with the less
complete, and faster, behavior as the default.