Move DDIStore with server-side implementation details to war-project

Problem

DDIStore class in stardat-ddiflatdb-rest has too many responsibilities:
database entity (Hibernate),
audited entity (Hibernate Envers),
search index entity (Hibernate Search)
DTO for REST communication
Thereby stardat-ddiflatdb-rest must hold dependencies on Hibernate and others.
These dependencies, which are actually implementation details of the microservice backend, are pulled into actually independent clients.
In the case of stardat-reporting this coupling made it even impossible to compile (!!!) its code base, because it uses Hibernate 4, but stardat-ddiflatdb-rest uses Hibernate 5. A stardat-reporting developer gets an exception about his implementation details caused by a very specific dep-conflict of a third compoment. More coupling is presumably not possible.