TST: fix unit tests

.gitignore

src/main/java/org/caosdb/server/database/DatabaseUtils.java

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

...ackend/implementation/MySQL/MySQLGetFileEntityByPath.java

...ackend/implementation/MySQL/MySQLGetFileRecordByPath.java

...ackend/implementation/MySQL/MySQLGetFilesInDirectory.java

...base/backend/implementation/MySQL/MySQLGetVirtualFSO.java

...ackend/implementation/MySQL/MySQLInsertFSODescriptor.java

...backend/implementation/MySQL/MySQLInsertSparseEntity.java

...database/backend/implementation/MySQL/MySQLListFiles.java

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

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

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

...main/java/org/caosdb/server/filesystem/FSODescriptor.java

...n/java/org/caosdb/server/resource/FileSystemResource.java

.../database/backend/transaction/BackendTransactionTest.java