formatting numbers for output

[Phlip]

Proclaimed Fernando Rodríguez from the mountaintops:

> Hi!
> 
> How can I format a number so it pretty prints:
> 
> 15,456.6 instead of 15456.6 ?

While you are at it, ensure the program prints 15.456,6 in parts of Europe 
& certain other places.

(Seriously, "15 456.6" with just a space is a happy median.)

-- 
  Phlip                          phlip_cpp at my-deja.com
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