Changes

Improved WADL URL guessing.

For some strange reason, the port is missing from the UriInfo record,
but only on the production server. This fix introduces some attempts to
guess the URI, it also adds the WADL uri to the bottom of the help
screen. For this to work, you need either (or both) of the following
lines in the nginx config:

    proxy_set_header        X-Original-Request-URI $scheme://$host$uri;
    proxy_set_header        Host $proxy_host;

The first one adds a proprietary header with the full "external" request
URI, the second fixes the standard Host: http header to include the port
(which is somehow missing in the nginx default). If the
X-Original-Request-URI header is present and works (i.e. -> 200 OK), it
is used, using this method you will also get a useful link at the bottom
of the help page.

Added lab (default) profile for default endpoints