Internal cleanup and improved setup

The demo for the 11.8 has now all the tests working, and the csdt export works cleanly.

I merged some improvements in the builds:

• You can specify the site to import directly with the "!Site" syntax, so you now install the demo with

  wcs-dt import #Demo-11.8 !Demo

You install everything with the single wcs-setup while sites is offline and deploy with the single wcs-deploy
.
There are a number of other internal things tidied but no other user visibile changes.