Merge branch 'f-filesystem-cleanup' into f-filesystem-core

...n/java/org/caosdb/server/database/proto/FlatProperty.java

.../java/org/caosdb/server/database/proto/ProtoProperty.java

...main/java/org/caosdb/server/database/proto/ProtoUser.java

...n/java/org/caosdb/server/database/proto/SparseEntity.java

...va/org/caosdb/server/database/proto/VerySparseEntity.java

...rg/caosdb/server/datatype/AbstractCollectionDatatype.java

...ain/java/org/caosdb/server/datatype/AbstractDatatype.java

...in/java/org/caosdb/server/datatype/AbstractEnumValue.java

...main/java/org/caosdb/server/datatype/CollectionValue.java

...n/java/org/caosdb/server/datatype/ReferenceDatatype2.java

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

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

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

src/main/java/org/caosdb/server/entity/EntityIdRegistry.java

...va/org/caosdb/server/entity/EntityIdRegistryStrategy.java

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

src/main/java/org/caosdb/server/entity/LegacyIds.java

src/main/java/org/caosdb/server/entity/MagicTypes.java

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

src/main/java/org/caosdb/server/entity/Role.java