Merge thehyve/master changes after April (London Hackaton)

ATTENTION:

**This needs also updated versions of**:
* core-api (https://github.com/transmart/transmart-core-api/pull/2)
* core-db (https://github.com/transmart/transmart-core-db/pull/5)
* Rmodules (https://github.com/transmart/Rmodules/pull/10)