Deploy with tests to corresponding db cluster

This PR adds new deploy scripts. With these, it will be possible to

- deploy the project to any target from inside the working directory
- run the nosetests against the db cluster corresponding to the target.

This removes the need to be inside /var/www to do deploys. It replaces our chsdi3 deploy scripts from https://github.com/geoadmin/deploy

Don't you have to run that twice to overribe mod_wsgi when somebody deployed before you?