Revert "BUG: replacement ids interfering with external ids"

.../database/backend/implementation/MySQL/DatabaseUtils.java

...ckend/implementation/MySQL/MySQLInsertEntityDatatype.java

...end/implementation/MySQL/MySQLInsertEntityProperties.java

...backend/implementation/MySQL/MySQLUpdateSparseEntity.java

...er/database/backend/implementation/MySQL/Replacement.java

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

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

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

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

src/main/java/org/caosdb/server/entity/wrapper/Property.java

src/main/java/org/caosdb/server/jobs/JobConfig.java

...ava/org/caosdb/server/jobs/core/CheckDatatypePresent.java

...ain/java/org/caosdb/server/jobs/core/CheckRefidValid.java

src/main/java/org/caosdb/server/transaction/Transaction.java

.../java/org/caosdb/server/transaction/WriteTransaction.java