restructure of code.

opp/core/src/main/java/Address.java

opp/core/src/main/java/Id.java

opp/core/src/main/java/OPStaffServiceImpl.java

opp/core/src/main/java/ObjectModification.java

opp/core/src/main/java/Operation.java

opp/core/src/main/java/OperationServiceImpl.java

opp/core/src/main/java/OperationTeam.java

opp/core/src/main/java/OperationTeamImpl.java

opp/core/src/main/java/Patient.java

opp/core/src/main/java/Repository.java

opp/core/src/main/java/TeamMember.java

opp/jdbc-repo-impl/src/main/java/JDBCRepository.java

opp/jdbc-repo-impl/src/test/java/Tests.java