This enables the default policy of Wendelin's data lake of "All can read but only authenticated can contribute."

Add two new bt5s and re-create the default configuration used for wendelin in both Scalability and Deployment tests.

By default enable automatic approval of credential requests if Wendelin's data lake bt5 is installed.
Add also proper warning accordingly.

Be explicit rather than implicit (not speifying argument lead to wrong argument being assigned and error in code).

See merge request !39

No need to check if no activities left as any left innocently failing activity can mark site as not installed. Fix skin layer and remove Guards so ERP5Site_isReady script can be use from anonymous user (this is fine as long as we use this bt5 ONLY for automated testing).

Run alarm every 30 minutes so enough time to finish previous run. Better check list of installed bt5.