Re: Profiles intro

As Carsten points out, this was a first cut so we'd have *something*  
and something by the pub date. I just wanted to note that there is a  
predictable comment in the offing and also that it's not clear  
*where* we should put the user guidance. So, in addition to the  
changes carsten already made, I've added the following editors note:

	"""Editor's Note: The working group intends to provide more guidance  
for uses about how to select a profile well suited for their  
situation. It is not yet determined whether that guidance will be  
here or in the Primer."""

The current primer has a very abbreviated discussion of profiles  
(since we didn't even know whether we'd have them, or which ones).

Cheers,
Bijan.