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.

Solution

• Done Copy DDIStore as it is to stardat-ddiflatdb
• Done Remove all server-side impl-details from DDIStore
• See template for microservice setup