ClassifierHeadersDescriptor?

I've been reworking the specs for 1.8, and updating the CswTerms and Cmds.

No, I haven't detailed out all of 1.8--I intend to learn a bit as I go. But I have made a good start.

Catch the latest at http://www.compstrm.org/wiki/uuid/BPRGo+qvONVL+QxkzCFLww3o/_