code: remove warning

...lient/src/main/java/cz/it4i/fiji/haas/PropertyHolder.java

.../haas/data_transfer/PersistentSynchronizationProcess.java

...java/cz/it4i/fiji/haas/data_transfer/Synchronization.java

...ent/src/main/java/cz/it4i/fiji/haas/ui/FXFrameNative.java

...j-client/src/main/java/cz/it4i/fiji/haas/ui/JFXPanel.java

...nt/src/main/java/cz/it4i/fiji/haas/ui/JavaFXRoutines.java

...nt/src/main/java/cz/it4i/fiji/haas/ui/ProgressDialog.java

.../main/java/cz/it4i/fiji/haas/ui/TableViewContextMenu.java

...n/java/cz/it4i/fiji/haas/ui/UpdatableObservableValue.java

haas-java-client/.classpath

...c/main/java/cz/it4i/fiji/haas_java_client/HaaSClient.java

...va/cz/it4i/fiji/haas_java_client/HaaSFileTransferImp.java

...ava/cz/it4i/fiji/haas_java_client/JobFileContentImpl.java

...ava/cz/it4i/fiji/haas_java_client/JobSettingsBuilder.java

.../java/cz/it4i/fiji/haas_java_client/MiddlewareTunnel.java

...i/haas_java_client/TransferFileProgressForHaaSClient.java

...c/test/java/cz/it4i/fiji/haas_java_client/GetJobInfo.java

...t4i/fiji/haas_java_client/TestCommunicationWithNodes.java

...as_java_client/TestConcurentAccessToHaaSFileTransfer.java

...ava/cz/it4i/fiji/haas_java_client/TestHaaSJavaClient.java