Merge branch 'dev' into f-cleanup-awi

...er/database/backend/transaction/RetrieveSparseEntity.java

.../database/backend/transaction/RetrieveVersionHistory.java

...ver/database/backend/transaction/RetrieveVersionInfo.java

.../server/database/backend/transaction/SetFileChecksum.java

...sdb/server/database/backend/transaction/UpdateEntity.java

...rver/database/backend/transaction/UpdateSparseEntity.java

src/main/java/caosdb/server/database/proto/SparseEntity.java

...java/caosdb/server/database/proto/VersionHistoryItem.java

src/main/java/caosdb/server/datatype/ReferenceDatatype2.java

src/main/java/caosdb/server/datatype/ReferenceValue.java

src/main/java/caosdb/server/entity/DeleteEntity.java

src/main/java/caosdb/server/entity/Entity.java

src/main/java/caosdb/server/entity/EntityID.java

src/main/java/caosdb/server/entity/EntityInterface.java

src/main/java/caosdb/server/entity/FileProperties.java

src/main/java/caosdb/server/entity/NamedEntity.java

src/main/java/caosdb/server/entity/RetrieveEntity.java

src/main/java/caosdb/server/entity/Version.java

src/main/java/caosdb/server/entity/container/Container.java

.../java/caosdb/server/entity/container/DeleteContainer.java