[atlas] Problems deleting measurements

You've asked for a lot here, and for most of it, the best I can offer 
you is: "I understand (and even share) your concerns, but what you're 
asking for takes a lot longer to implement than you may like.  However, 
we are working on clarifying the interface in this area."

Now, regarding some of your confusion, I'll put it all in point-form to 
keep it simple:

* There is no way to delete a measurement.  Not via the website, and 
not via the REST API.
* As REST offers 4 basic verbs for interface: GET, PUT, POST, and 
DELETE, we opted to use DELETE as the "STOP" method, as we have no 
intention of ever actually deleting measurements.
* The concept of archiving measurements is being re-worked and may 
disappear only to be re-used later as a means of hiding the 
measurements from your list.  We're still working on what the Right Way 
to handle this should be.

I hope that clears things up for you.