GitLab

* print floats with only 2 decimals in the status page
* delete dead containers that are forgot after crashing
* reconsider services for scheduling that should be active, but are dead (they crashed and are elastic)

Small usability fixes for the execution inspect page
Move all the database access in the state package
Remove image management, it is too slow to download images before while the user waits the the ZApp to start
Make several thread loops more robust in case of uncaught exceptions